Malicious PDF — malware analysis report

Static analysis result for SHA-256 4770a77c25de8df5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-01 18:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: abc2ca177cc791a9362cd0b250eb877e SHA-1: 4118aefb67f5d554cd1121ca00fa82ab97776e4e SHA-256: 4770a77c25de8df5910a32e7c9a30bc8fdeb78bab2153ffedd40063b98e10190
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/pbw?utm_term=can+i+install+apk+on+android+tv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487201/normal_6000448a03da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486221/normal_5fd67cdc32509.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/vufaxal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416939/normal_5fffc24258cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_603da6e8a0567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6013c4bee8eee.pdfIn PDF document text
    • https://vitudanowule.weebly.com/uploads/1/3/5/3/135341415/vevamox_babuti_kopukovibe_bekolilorot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c4b8e0-027a-40f6-8e80-ce70b7c11dd8/42153869868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eee2472-660d-4aac-9e30-bab31f55c04c/jivevoguwezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9812b0c7-71e6-4421-a1a6-7479ba4fb852/how_to_use_zebra_gk420d_printer.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/how_to_refill_a_stanley_staple_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92522dad-7b30-49e4-b8ea-ab7e3c3c5b94/pokemon_revolution_online_how_to_go_to_cinnabar_island.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144432960/34113922001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56eca41b-5e6e-46bf-8b00-f4a63ba73495/why_is_my_charger_blinking_red_and_green.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/pisubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded4d7be-a7d6-48e5-983f-1e43ec132c0d/fonutopebimagefolu.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426462/mit_lock_picking_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f6c36f-de8f-49b4-a3fb-7a350ec76869/bizorutatesibada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697ad499-6daa-43ac-adb2-136ce3dc3845/pozexarur.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418206/how_to_pass_your_permit_test_in_minnesota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe224a0f-c328-4799-9835-c437385417e8/3983791486.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 4980 bytes
SHA-256: e14c383bfc847e4e7fba1fa9308fb61f397f437f61b8f5f1072c93d8c9fc32da
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10256 bytes
SHA-256: 5c4afbf13f45218fae44c0c4200498dffb370a26ea8caeda2fa25d9e65012133