Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cb5f0adfeaae92…

MALICIOUS

PDF

83.6 KB Created: 2021-02-23 01:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 73bce7d0b0bb6f2781af7eb25a29e517 SHA-1: dcd9dd81bdcdbaf19733d6687c506b452606c125 SHA-256: 74cb5f0adfeaae92e3f5f74424fc235da19c9303c8681e7fe7366ee844f9b2ca
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs likely serve as lures to phishing or malware distribution sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to redirect users.

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
  • 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.
  • 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://druttle.ru/wix?keyword=x+rocker+gaming+chair+instruction+manual PDF link annotation
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/pizalubozigere_rugeba.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/3985a.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/eibD7ie/doomsday_escape_walkthrough_level_12.pdfIn PDF document text
    • https://lazogipinu.weebly.com/uploads/1/3/1/0/131069887/1610250.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/ejjhdhh/vetixe.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/vekazufonabugotopufi.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/ayfjf7N/63651797684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5fd370702e3d4.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/ghhesid/minelijizadowijenijideva.pdfIn PDF document text
    • http://afracheat3.xyz/how_to_drain_lg_direct_drive_washing_machine50z2a.pdfIn PDF document text
    • http://tamakar.tech/student_information_management_system_project_in_phpee22y.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/d251157.pdfIn PDF document text
    • http://barbanapoli.moscow/vince_gironda_6x61irl1.pdfIn PDF document text
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/0bc398e76afee73.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://s3.amazonaws.com/vawoginele/72770422443.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_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 5136 bytes
SHA-256: 113b52d5b1b84d2f880260fe5af1ac113d7d13f173f84a67d5a7b3ea98c9fc6c
font_01_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 11232 bytes
SHA-256: 4ff1709a04268a6b5fa17f10c4c6e2c54056e8f414ae0ab4ba22f9c6a5c0d990
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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