Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9654bced32cf2af…

MALICIOUS

PDF

84.0 KB Created: 2021-03-03 16:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e10ac20d2c1d61934849c76a58dad70c SHA-1: 3cbd82a4b6beb42f91fc00b8c15120d8313d50f2 SHA-256: b9654bced32cf2af6cad43aa19a9faa507dc991fadd6b11f0d8a530ff273f340
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The primary URL, 'https://maypoin.ru/award?keyword=how+to+open+wall+safe+gta+5', indicates a lure related to a video game cheat. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://maypoin.ru/award?keyword=how+to+open+wall+safe+gta+5 PDF link annotation
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/muluzujoripujexivef.pdfIn PDF document text
    • http://tetuzat.22web.org/pefipuzutig.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/gicjd7s/1161173832.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/ca_real_id_drivers_license_requirements.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/5062825877.pdfIn PDF document text
    • http://wildboost.club/bsplayer_apk_4pdahnxqj.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/dbzhggf/zakusinawiz.pdfIn PDF document text
    • http://xtreme-sport.ru/the_practicing_mind_quotesjq4j8.pdfIn PDF document text
    • https://cdn.sqhk.co/razulati/jrggvGl/free_rock_and_roll_ringtones_for_iphone.pdfIn PDF document text
    • http://coolvdomaion.online/13899329129qfm8q.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/feAggjb/inside_out_movie_free_download_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/3giCgej/zexubanatusodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kurejaj.epizy.com/thyroid_gland_definition.pdfIn PDF document text
    • http://zanawolusebil.epizy.com/natifefajapasovikivasuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/fahrenheit_451_test_questions_and_answers.pdfIn PDF document text
    • http://vugofixev.rf.gd/bpmn_2._0_example.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/pcos_metformin_and_diet_pills.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_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 5152 bytes
SHA-256: 7eb4c14b4c60d021bfc61c1c8c246a88552c54b9b20e452740940f59665801ab
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10352 bytes
SHA-256: 09172b52614bb5744e5b2008c76f927570317ed730933389c4684491bba7defb

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