Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff81157e9d3680b…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 17:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 76033fb62603b5d9fef62ba823644e09 SHA-1: 5b911d1f469bebacb2d7611f6bd86b5e249681c4 SHA-256: 9ff81157e9d3680b1c2cda2ce976d71b740bb533a5fa47036c9eea324741b348
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF farms, suggesting a link-farming or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=graco+forever+extend2fit+manual PDF link annotation
    • https://cdn.sqhk.co/vatuliwa/bghibjf/40639997133.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/cxietif/fuxifibu.pdfIn PDF document text
    • https://nubenitenaw.weebly.com/uploads/1/3/4/0/134016689/94e221772be9.pdfIn PDF document text
    • http://salet.store/autocad_3d_bathroom_blocks_freeqcaqm.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/vaxawotikineti.pdfIn PDF document text
    • https://zexirajeroluwub.weebly.com/uploads/1/3/4/8/134848753/fc6b54a.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/d112ed4d6.pdfIn PDF document text
    • https://linonojito.weebly.com/uploads/1/3/1/3/131380720/d310a0.pdfIn PDF document text
    • https://cdn.sqhk.co/luketopaja/hthijbL/81073237541.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/pafidikuw.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/311365.pdfIn PDF document text
    • http://goodxday.xyz/what_is_social_justice_in_geographyo1x7h.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/lovetijif/39755579082.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/whirlpool_wmh76719cs_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/43219935144.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/21285477756.pdfIn PDF document text
    • http://xokesuluz.epizy.com/graphic_design_proof_approval_form.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/kivogerop.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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 5280 bytes
SHA-256: 1a45624dc3f6424719219cfe708e5aaf84b5577e33742944596733efafbdd70d
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 10576 bytes
SHA-256: 9668fbb1de00c79426acda89e92649aab5f2d21a53d33ec57dfd117ac172258a

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