Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c79a8078233dfc5…

MALICIOUS

PDF

80.6 KB Created: 2021-02-15 07:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 56090df2ad8d500ff5d0e10d5e923bba SHA-1: be846d20c466be2f4af9406128d1f8c5367b54f8 SHA-256: 9c79a8078233dfc5069a631e00338b0bfa22670e1c00275764b1bc7f951e06b5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to other PDF files, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=black+and+decker+spotlight+manual PDF link annotation
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/saxodejofup.pdfIn PDF document text
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/lezigojaxe-dategewadof-mavulur-wilinoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_60236cf8326e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_600919b18ff48.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/6599646700mzc8m.pdfIn PDF document text
    • http://okrasote.info/animation_desk_classic_apkkdbh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fff6c0e6713a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fe1632bb1dd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389586/normal_5ff7e2b19b07d.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/9839468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fdcbd3bc1789.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/jidejujuzigeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/wegularebavo.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/fetib.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/nijexoloj.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/5197822097.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/liszt_la_campanella_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/6108612359.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/agendas_for_meetings_templates.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_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 5600 bytes
SHA-256: ee97e1363fda44eb981dc2018abb3b73cb584f386c2d6e4663ac479a3cb18c2d
font_01_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 10660 bytes
SHA-256: 0deb711a3672c86affb433e6c107add6b48bb527ec62a35f90e79b855f1451e3

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