Malicious PDF — malware analysis report

Static analysis result for SHA-256 b734a32c85476e24…

MALICIOUS

PDF

76.9 KB Created: 2021-06-07 16:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c52c68abd3feb95424c38c6a720f693 SHA-1: d46431eb7c016c9d19c0608ea610ebe5a8f04fc4 SHA-256: b734a32c85476e24567739859cd999412fd140565691c163d6b5f591fdf40e1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/pbw?utm_term=michelle+lewin+la+dieta+del+cuerpazo+pdf
    • https://cdn-cms.f-static.net/uploads/4475383/normal_606cfcc8175e9.pdf
    • https://cdn-cms.f-static.net/uploads/4482218/normal_6047c2cd31469.pdf
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/957539.pdf
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/a9d06a3.pdf
    • https://cdn-cms.f-static.net/uploads/4459321/normal_5fda396d94746.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_6017d92cf278a.pdf
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/bbb97af8.pdf
    • https://gavabedaxi.weebly.com/uploads/1/3/4/9/134902957/sijuk.pdf
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fd241ff99dc4.pdf
    • https://static.s123-cdn-static.com/uploads/4420448/normal_600263f035535.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6057e66d62acb.pdf
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffd4c315e398.pdf
    • https://cdn-cms.f-static.net/uploads/4471971/normal_600faaff3867d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4408989/normal_60b70691d72fc.pdf
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/wumudore-soginilirudava.pdf
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/1212059.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_60357097981b6.pdf
    • https://cdn-cms.f-static.net/uploads/4426071/normal_605cabef26243.pdf
    • https://xuxefaposil.weebly.com/uploads/1/3/4/3/134393683/fovazodizowik.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5feaf10b13720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lezakoliz.pbworks.com/f/the_boy_in_the_striped_pyjamas_movie_free_download.pdf
    • http://sikovifif.pbworks.com/f/kingdom_death_core_rulebook.pdf
    • http://lezakoliz.pbworks.com/w/file/fetch/144587337/teddy_bear_outline_template_free.pdf
    • http://gulisapil.pbworks.com/f/vuxupupazu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf5.bin
8b3588b7cdfab54728991998e9d002ecf732dce640d9a97f2c07934db252f394
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 5092 bytes
font_01_sfnt_off0000ef4b.bin
48347d8f8e88602dfa9c7cf63ac38bbaf4f0d3da085392cd0db5a77f48e94e56
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 12532 bytes
font_02_sfnt_off000117c9.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 4324 bytes