Malicious PDF — malware analysis report

Static analysis result for SHA-256 609a29ced3f5f3e7…

MALICIOUS

PDF

74.3 KB Created: 2021-02-23 17:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8ffb15b140aac079310a18fd1bf64d33 SHA-1: 0f94775d6dfa069b01ebe14abbe8af50ff93849b SHA-256: 609a29ced3f5f3e7e7981a6e346e5a59736e3190946514433ea491c14c1ab0ca
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. While the document body is heavily obfuscated, the presence of numerous external URLs suggests a phishing or SEO-based malicious distribution strategy. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

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://seumenha.ru/123?utm_term=how+to+get+honeywell+thermostat+out+of+recovery+mode PDF link annotation
    • https://wuzivizafexun.weebly.com/uploads/1/3/1/4/131453021/mabonujujumab.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/lirivewilo-fabileka.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/xaninaxu-lafepovukidu-wolufejalef.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/giTihFF/vafiwem.pdfIn PDF document text
    • http://islta.fun/commercial_sublease_agreement_template_uk5huiw.pdfIn PDF document text
    • https://rolugoxeve.weebly.com/uploads/1/3/1/3/131380951/kemadibefepupa_gonoximib.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/wodoxigenan.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/nibexerudofezudelur.pdfIn PDF document text
    • http://fruit-citrus.space/best_pencil_sketch_app_for_pc4r1p7.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/53165740657gfg5s.pdfIn PDF document text
    • https://navesurupuseg.weebly.com/uploads/1/3/3/9/133997449/1492640.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/kodipopujufipig/ar_rahman_surah.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/fha_mortgage_insurance_cancellation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/axel_springer_se_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/panot.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/66845112183.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/todo_list_template_html_css.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/pamuwavogezovineju.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/south_africa_latest_music.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

Related samples 8

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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 5648 bytes
SHA-256: 40107bf2fcc5a89038c29497f7b94890ebb02e31031271f9ca11ec4bb2d85c98
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 10056 bytes
SHA-256: 18a23db83cddf984710020912f6d1abcf7fabc964f991917aa77a5a74ea018ee

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