Malicious PDF — malware analysis report

Static analysis result for SHA-256 a160cb7136d334cf…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 16:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 85f5eb9632f0afbc8f617f355c72e493 SHA-1: 7fcda050e1c8fe8e4eb6410697aa95e4b5696f1c SHA-256: a160cb7136d334cf2742a8e8e579849653f46071784fa9736e70f1c3d3bd2e5e
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to numerous external sites. The document body, though truncated, suggests a lure related to 'interview preparation', and the embedded URLs point to domains often associated with phishing or malware distribution. The presence of multiple external links and the overall structure strongly indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/award?keyword=interview+preparation+in+english+pdf PDF link annotation
    • https://kaxaratit.weebly.com/uploads/1/3/5/3/135383379/bufuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc98bfcc95e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_606376eadb2e7.pdfIn PDF document text
    • http://ttttrrrr.space/is_red_face_a_sign_of_pregnancym43g7.pdfIn PDF document text
    • http://peskomment.ru/979689918275fpmr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_60380d12ce3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_5fd952cc23c0d.pdfIn PDF document text
    • https://ruritavi.weebly.com/uploads/1/3/3/9/133988031/pudalajavowero-mowajanir-pewiluji.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4466664/normal_603b43d13b4cc.pdfIn PDF document text
    • http://bitcoins-profits.com/zedururelufexuguxatibuw3ubgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefcb96c-6a91-4617-aaee-cdc19ccb21c9/what_are_the_three_types_of_conflict_in_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/aviva_platform_login_adviser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb15cb4-1454-41ad-a27f-ce3193b0a175/dokoweriwekupurufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8f7632-e4ab-4358-9b2a-f7df51aa1934/navy_leadership_training_continuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bd3486-2890-4910-9668-59f3356e2a98/model_336c_curly_maple_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749b2f91-5f7c-42cb-94d6-6eceef9f4d17/tigituzudugurozubovovoro.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/pride_and_prejudice_movie_2005_where_to_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfff24a7-e015-446c-8df7-2a6dd034a053/zedikudeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb2678f-3882-43fc-9e8c-cbb03572167a/how_to_clean_furnace_filter_in_dishwasher.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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 5392 bytes
SHA-256: 7dc0f2030866d00e334d4a856c94dde7c4df86daa607ae46203d225cb17eecdc
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 12572 bytes
SHA-256: 68da3f04f7d8b2cd1addd7b2d85da45ae9de2f57ce008c1a2ce936d65e163835

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