Malicious PDF — malware analysis report

Static analysis result for SHA-256 c324b709c78e012b…

MALICIOUS

PDF

64.9 KB Created: 2020-12-15 20:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 16fab9ce55e48c03fef0668758cbc5ee SHA-1: 165882b3efd88de4b69645738da044e6eb9c66aa SHA-256: c324b709c78e012bda7c73f8674ca0dd02b124f647061219f6df6efe8ccdd932
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafftec.ru/strik?utm_term=muscles+of+the+larynx+mnemonic PDF link annotation
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/57b19aa7.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/3819870.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/gepavan.pdfIn PDF document text
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/puzim.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/zebaze_jigelokufama_peponepu.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/5560304.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/mekonulegipero/wow_destro_lock_arena_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381e4b51-3edc-4b17-8a9c-eaa9e701c8ee/principle_of_overload_progression_and_specificity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4429d162-6299-4b96-b9ae-186a7f167d6a/777_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a69795f-5752-4b03-9f20-9243d29a8190/doxaxobenal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaf2c35-51c0-4bc8-8b11-258b130113dd/4801335228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbf1066-353a-46e1-b27e-3fd2f233026f/nikon_slughunter_scope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed46816c-760b-41c7-8e1c-b763c0367af2/world_history_answers_keys_final_exam_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/2018_chevrolet_equinox_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ef1c14-fcb9-420f-8274-6e63b466ac04/lejotagizujemire.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_off0000c27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 5296 bytes
SHA-256: bff026c954c9de765db6de89535eca9855ed13786810e865e03c48f867df5824
font_01_sfnt_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 10024 bytes
SHA-256: f3c1ef252236bb8c77bf2a60f61ac6294b4c4f166a8cd68f4b8e4c73d6a24e5b

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