Malicious PDF — malware analysis report

Static analysis result for SHA-256 148f4eba395f3982…

MALICIOUS

PDF

91.8 KB Created: 2021-06-13 13:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f312e7d560b0db636742ce7ec5e669da SHA-1: d7e44785f5c7ad03b51e8564723542388e19b9e4 SHA-256: 148f4eba395f398228e0057683f9422f221624ef2bc87062d1c3fc3c0538e087
314 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information T1071.001 Web Protocols

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains a link farm and lures the user with a fake software activator, while instructing them to disable security software and use clipboard commands for execution. The embedded URLs suggest a multi-stage attack, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/pbw?utm_term=office+and+windows+10+activator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460266/normal_5fd7b36cb5ad3.pdfIn PDF document text
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/simedotawaku.pdfIn PDF document text
    • https://zuwuwenisobos.weebly.com/uploads/1/3/7/5/137500091/2908749.pdfIn PDF document text
    • https://muxuredoli.weebly.com/uploads/1/3/1/3/131380086/2391003.pdfIn PDF document text
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/13320a31999.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/fobopovaredorowalufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_602473524871e.pdfIn PDF document text
    • https://nunavupogo.weebly.com/uploads/1/3/4/4/134471291/pexadune.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/gomojitabaxem.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/3445943.pdfIn PDF document text
    • https://doguxugufini.weebly.com/uploads/1/3/0/7/130739878/4910931.pdfIn PDF document text
    • https://mexubigewexuni.weebly.com/uploads/1/3/1/3/131384635/pezen_wejizomilowofef.pdfIn PDF document text
    • https://nupirunu.weebly.com/uploads/1/3/4/2/134265900/debekejose.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/lisemepoxudidumob.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/katojeliw-ginofolalufilov-kokazodazevilon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fd39a5489012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4f5e72bb-0a4a-4f88-bc77-4c3e42499259/char-broil_tru-infrared_commercial_3-burner_natural_gas_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34626c96-8604-474a-8df2-add48d88d52b/ishq_me_marjawan_2_full_title_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370f36f5-e5c5-411e-b815-1e647ba952b6/which_java_certification_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973c8ae1-1d94-4000-8e4e-86d715ee687d/what_is_a_career_assessment_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f65149d-c597-4c91-b673-3147a4072853/zupazegadizinitelal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e02bf28-ad20-4f0d-9d2b-bca05cb01628/how_much_is_samsung_galaxy_tab_3_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38be4b01-86c1-4ea8-8ab2-33af500cf3c6/7769066846.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 5144 bytes
SHA-256: a16285a571ff645ce9e912c75e35d679a0bc9c70f027a0180f44f8473e3043f6
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 15868 bytes
SHA-256: 23c9ea47556f1263691187317bbedd1eb57554f57222adde721f924266bd146b
font_02_sfnt_off00015390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15390 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176