Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b362f8ad8c779d3…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 01:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d762853f21cbb93762fd2e225fff28f SHA-1: 55f4586fc7e343b4ccffc9cd0db2042b7f8a4449 SHA-256: 9b362f8ad8c779d370881e0c67ba7d59af36e879b2fc5b9420d4a9a97c45244c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one primary link to 'bologen.ru' is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links generated to appear as legitimate SEO content, which is a common tactic for distributing malware or phishing. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via the suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://bologen.ru/wb?keyword=basic%20electrical%20engineering%20pdf%20notes%20pokhara%20university PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ff84a76e7e06.pdfIn PDF document text
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/f86559689d.pdfIn PDF document text
    • https://jorazejub.weebly.com/uploads/1/3/2/6/132695428/d4c76128d8.pdfIn PDF document text
    • http://hookup757.fun/gracel_hmm_torrentzxcc2.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/7303b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_6001d2343034e.pdfIn PDF document text
    • http://trokot-tonirovka.online/79149510810305rf.pdfIn PDF document text
    • http://bbflowers.net/938450044955anpt.pdfIn PDF document text
    • http://detonic-italy.website/zegemobugosotedubujog8o9p.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/jolunenafobuw/pevupibobinuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/math_calculator_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/kindergarten_learning_time_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/bengali_film_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/wow_tribal_leatherworking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/visiwurep.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/partituras_lldm_coro.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/baazigar_full_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/davejijuxufoxewaseted.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/12197942924.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/63498615649.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5692 bytes
SHA-256: 874e5b3916cd99ab6d69b36d6031c73c914875eb358b253807485137ffb4d813
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 11252 bytes
SHA-256: fa2eaf22c2de543f8c7240c53fef1eb699f014835ce882dce41af4fbdda8e042

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