Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82123c25d1adcae…

MALICIOUS

PDF

66.2 KB Created: 2021-02-28 16:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 39948d3ff58ccfd6228bea1a18a84f46 SHA-1: 7d8042d006ff802f552e379a772ff833d7f7f67d SHA-256: c82123c25d1adcaeea9909da931251f779e2df2dff7a31f025be7b43e95ca331
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The embedded URL `https://fokemale.ru/wix?keyword=hitachi+c10rj+parts` is likely used to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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 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://fokemale.ru/wix?keyword=hitachi+c10rj+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379217/normal_5fe31d0695fc2.pdfIn PDF document text
    • http://testertumentum.space/pigudg7spd.pdfIn PDF document text
    • http://ru-en.xyz/321680083129pgdp.pdfIn PDF document text
    • http://ita-yog.space/bleacher_report_champions_league_replay9aacc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5ffd80a4e2caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_602af527b069d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462376/normal_602aacb526f5b.pdfIn PDF document text
    • http://creditactive.info/tewexozewawilodobwqgy.pdfIn PDF document text
    • http://relax35.ru/greenery_wedding_program_template2rtgz.pdfIn PDF document text
    • http://sesalon.xyz/firajobefimo4gklf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_600aca50c51d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_6013a89183a01.pdfIn PDF document text
    • http://gbo.guru/alcatel_2019g_g_mobile_phone_user_manualta3r3.pdfIn PDF document text
    • http://avbox.org/28971076061kba5l.pdfIn PDF document text
    • http://rodina38.ru/455353607128btrr.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/farokof/marketing_strategy_job_description_template.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_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 5220 bytes
SHA-256: de8cfe94d5fa29b36e18f812f77f015a3ab3e6e3569ebc80bb7fd3ccc751c5e4
font_01_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 10288 bytes
SHA-256: 8d36d77119ff4eef8d64fefffffddc88e519ab0931e7f56cbbd153c1e01ddd42

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