Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0ac7c3c1928b5d…

MALICIOUS

PDF

76.9 KB Created: 2021-03-30 17:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 97a6a445670842c48943624affe1ad78 SHA-1: 0624583b839c220c7c039b17015ffd4ecd5e260d SHA-256: 3f0ac7c3c1928b5dfa7759545e417d7eb62cb0f16bd9e2de7d4a7d06342d49c3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and extensive link farm are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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=reglas+del+voleibol+sentado PDF link annotation
    • https://cdn.sqhk.co/dagozuwemep/SJhGhi4/chateau_color_code.pdfIn PDF document text
    • http://pokovata.scienceontheweb.net/7982107651.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/jisejo.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/car_buying_checklist_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nevowokazem/ciiiiAZ/case_study_analysis_format_harvard.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/jiJw4It/counter_terrorist_swat_attack_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_eb5ee87ea44641f6b131a7ec656ebc4a.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_e819aaa9623640e0840698cecc1183c7.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_8ea6a8cddd3e4306947730a69c7f63ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/math_puzzle_games.pdfIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_68d712a579d947b5875a6409ba8d8b87.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_c583edfb373a4a8091abe81d6ab6b2b1.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_e98154c706b34d7196f1b2e871d99956.pdf?index=trueIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_c7057093e95744559c6b8e5f00a8c0c6.pdf?index=trueIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_eada55cbd6f64f85876491fb0ab4ff83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/97637721712.pdfIn PDF document text
    • https://545b0fba-b68f-4464-8826-e8b601f8ca85.filesusr.com/ugd/bca722_a0cc30da08dd45738b63420090db7259.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_5b503dfed2a747b7810b83effb7b9071.pdf?index=trueIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_f00923cff6dd41eda3c34d53951f1abe.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_a4dc672d4fc74d57b81e5e7d2b01b028.pdf?index=trueIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_8c0095b667db49d29ca9960441ea5e97.pdf?index=trueIn 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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5104 bytes
SHA-256: 4a9edd104c6f6fc9d6c31cd926b9862ef2dac3bf78daddd496b5c6785424d8ec
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 11840 bytes
SHA-256: 2272f17ea5e27f8052ece67df2dc07a0e9e8fd0a5a69183c35eb70483cfcbc8c