Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e566039ef1758e…

MALICIOUS

PDF

80.3 KB Created: 2021-04-26 19:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3c02bef0afdc055b4f4932f0e9be327f SHA-1: b8ab0aa24b752a63fe01c9e0746841c78378d76a SHA-256: f1e566039ef1758ec8dd6f54661d9f8e3d7850f51ffa7f5a07d94fa822c374f8
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, one of which is a direct link to a PDF file hosted on a suspicious domain. The presence of a 'download button' heuristic further suggests a lure to download a payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt to deliver a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://seumenha.ru/strik?utm_term=how+to+wear+army+pt+uniform PDF link annotation
    • https://cdn.sqhk.co/devisojop/hxTjh3h/21040430801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_60201f4a8f044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416319/normal_5feb5bc5c285e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_606ac24b49251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_604fb532ac61e.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/f9ERhg7/pinballz_lake_creek_go_karts.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/cMDicic/funny_orange_names.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitana/ejfhfja/basketball_world_cup_2020.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/49780719473.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/duvapegoleva/e7iegfo/dungeon_keeper_4_download_windows_7.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/58635583174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_60353b7e13b83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451206/normal_5ff758250beb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_5fda776562b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_604633cfb1c6b.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/como_invertir_en_la_bolsa_mexicana_de_valores.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_602517bc1c77c.pdfIn PDF document text
    • https://cdn.sqhk.co/lolumebitIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 4992 bytes
SHA-256: f3ef936ab27a29029232ee79200144c416de71983124cc52ffe1839bb88f85ba
font_01_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 11276 bytes
SHA-256: 108bc5a878e618dab9680852d543a75894169caf68660728cb0cc71978c7f738

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