Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99a745190a2aee…

MALICIOUS

PDF

72.6 KB Created: 2021-02-26 10:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 33acfc9a5d4c0a43bd7278a55609debc SHA-1: 7e70251fe830f4cae619bfa4c06a236ff07c9ba1 SHA-256: 7f99a745190a2aeeaf201b22f7c6034f3762ccd12810595fd85ffb81a8efe62f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one pointing to 'seumenha.ru', suggesting a phishing or redirection attempt. The document body, though partially corrupted, contains a job-related title, reinforcing the lure. No scripts were extracted, but the extensive link farm indicates a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=jobs+on+american+bases+in+germany PDF link annotation
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/c087c.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/jggjPij/vipomidanunuxuwesig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_5fd2ce18e6c46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474446/normal_5fee6c88a0cc0.pdfIn PDF document text
    • https://tetejinuditobig.weebly.com/uploads/1/3/5/9/135973847/mikewepe.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/mozoz-suzikoj-lubakipumuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd67e1f797b1.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/lopozalogopakodu.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/tufubija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_6031e9e60318b.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/jjEEDjf/stick_run_2.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/2544adc438bc.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/gjciaic/hatchimals_colleggtibles_cosmic_candy_limited.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/he4mW8e/74343866680.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/ieraxDO/wildscapes_mod_apk.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/xamapebonijos/nenefimigeloduvon.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/sameni.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_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 5320 bytes
SHA-256: 17d22377ac122effecaa0a889ca01957b090971111ae60834f6524048d059d26
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10324 bytes
SHA-256: e205229bf4f174a2989a6a366b7118c847351b74837d86e22c4b09727f924bed

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