Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f14c436c4c897eb…

MALICIOUS

PDF

71.1 KB Created: 2021-03-26 09:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f86a0a9a4b16f41dae486556e3f44f8e SHA-1: f4f643dc9fbeebc995717da30e307b663be97428 SHA-256: 6f14c436c4c897eb7468e96214a43f839b3ae5dbcc3bd44fc0b79cdcac9f0508
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=minn+kota+terrova+80+parts+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417997/normal_602c14ce025e3.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/vsjhQhg/75078156695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fd7c7a9e5251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5feba3c9ec1d2.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/9czq5ki/gonutorifodokejojom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_5ff2777de08ca.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/hgbmrE8/doom_eternal_heavy_cannon.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/icFFifN/karulavaxuzurawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_601c6b168c095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6021963e86824.pdfIn PDF document text
    • https://cdn.sqhk.co/zezofajanaf/Ghehh8x/sudatuniwaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_603a3e211c5af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_603042548f4e4.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/39911826900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najekaweza.onlinewebshop.net/business_process_management_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/fanozeza.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/edital_auditor_fiscal_receita_federal_2020.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_929c850bc6aa47b7b94b491c2ca7b560.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_cfffcc7a9e1f446899c921e76623f70c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/metro_2033_redux_library_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/all_ugandan_gospel_music.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_b4fdf162eaab4982afc52b0e6276f9e2.pdf?index=trueIn PDF document text
    • http://donufuruwitij.atwebpages.com/xakemed.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_1ccf136cb8b74d598f458fe466c061af.pdf?index=trueIn 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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 5276 bytes
SHA-256: 0bdbe399b15dc8e368c21a62c965da9e85b9a8a184c294a047b4c57209751118
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 10952 bytes
SHA-256: 238faa7e75cd54236dc6d4a05d3aa8ab89025b8f0603c698a538f438b7adfddc