Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fcad25a9a8a6c3…

MALICIOUS

PDF

78.1 KB Created: 2021-04-06 07:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 48db282e9dc5494f8ca4f01b1c72bdd8 SHA-1: 1f33a1a84ec8021be05ec1b7e18ae38b6a2de635 SHA-256: 82fcad25a9a8a6c3a26877d7c9fd69f796fb24680e29b0b60cd74a981dd1c4ba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'vilenefex.ru/award', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for links, further supporting malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://vilenefex.ru/award?keyword=evolutionary+biogeography+pdf PDF link annotation
    • https://cdn.sqhk.co/nuzozuni/Jhihjji/bad_banks_season_2_uk_release_date.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/c435ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_60071d85c92a0.pdfIn PDF document text
    • https://nilezejexi.weebly.com/uploads/1/3/4/7/134737846/mizudiposegadi.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/jQRhcZv/fupusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fdaf0f46b9a0.pdfIn PDF document text
    • http://infokurs.design/777853932512p0du.pdfIn PDF document text
    • http://mantenancie.com/aluminum_hydroxidexiggk.pdfIn PDF document text
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/lokaninufukibar-venawufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_600fd438111b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446017/normal_5ff4be36a4bff.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/cibzm6B/3324263138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446161/normal_5fdbfb530a806.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/QNNifgj/bus_simulator_ultimate_mac_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fc7249202f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_603f34e97bd85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fc6daceeb7df.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/tikovegafo.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/manuwuwavojefodejo.pdfIn PDF document text
    • http://lynciguest.com/2003_jeep_liberty_sport_wheel_sizegtzzn.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/zonebon/xixagujavirureregegen.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/vuxozivef.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/gufupifolegaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/ninenibisafelunimejizim.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/word_label_template_avery_5366.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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 5384 bytes
SHA-256: 536e7df9d0280c624a99f521c817dfbbb3f06e4f145649c534511a948bd543cc
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 10816 bytes
SHA-256: fc5f8ca0aedcc3b2c577508e4409ccac475faead3f0ab3659c354a7614f2093f

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