Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ba5ee29c2fb72f…

MALICIOUS

PDF

84.9 KB Created: 2021-02-18 14:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e1fc05e90c55bbb84d0d50a6a800251 SHA-1: 4ec20020d0b9d7d65a656ff8baf73d961ebf8b2f SHA-256: 16ba5ee29c2fb72fc1d742cd9c1f755d2b6b95212c435ab09017203d471f60b2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/aws?utm_term=remington+12+inch+electric+chainsaw+chain PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389354/normal_5ffb4a8576b58.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/iediB2e/alone_season_7_cast_bios.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/hFiitgg/swat_cast_luca_s_brother.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/icghid1/personal_swot_analysis_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6021f856f2241.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/Fheggeg/36305551285.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/pimulosaw-duselovo-fovupibobalumi.pdfIn PDF document text
    • http://dithetsen.xyz/74964242042sdtr6.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/free_music_websites_for_schoolyvlye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5fd68dd89f8d7.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ehgjjEb/zivitapadekowotanufet.pdfIn PDF document text
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/5606675.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/cGxjijb/xemasimuxefadotorolabu.pdfIn PDF document text
    • http://jumbochecker.com/gewujivakiwe63z0s.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/6656357.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/IFhj5Q5/wapisa.pdfIn PDF document text
    • http://good-production20.site/java_inheritance_mcq_with_answers8v99u.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/fQihhcL/93956568350.pdfIn PDF document text
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/6716065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_6027be1a9c758.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/lerezazo/setos.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_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 5496 bytes
SHA-256: 5dd11697a8f4502763582115d420ebe032005b4591b865eadb3da5b808fef0f4
font_01_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 10736 bytes
SHA-256: 04aa99c2d38a28959eeb5e3d2df7a48ce7356d9887dcc6939882d339b03cbd4d