Malicious PDF — malware analysis report

Static analysis result for SHA-256 d377b82402ece274…

MALICIOUS

PDF

86.8 KB Created: 2020-11-19 04:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3899917ca9bfdaaaffd842e1a395ba46 SHA-1: d468986636e83e2ef99788d9876c10e2e6b245a1 SHA-256: d377b82402ece27477df5797ceef65b6417fb4b631b3e8ed1c8fffed8ae6dfa7
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a large number of external links, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=owners+manual+forvolvo+%252A%252A%252A+dl
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/a08ec82d.pdf
    • https://cdn-cms.f-static.net/uploads/4425726/normal_5f9d8c1bb0e63.pdf
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5fa638a60604a.pdf
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fb4b99ae7077.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f983527a9ce6.pdf
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/60f3dc73.pdf
    • https://cdn-cms.f-static.net/uploads/4409797/normal_5fb29f0f96595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c8e5eefd-2bdc-4416-b9cb-ccaedcf36cc5/binomial_models_in_finance.pdf
    • https://uploads.strikinglycdn.com/files/006811e5-02ae-4694-a373-a86c9675bd6c/81801968970.pdf
    • https://uploads.strikinglycdn.com/files/78a5598f-a432-4c57-94e4-5fc58f0c93b4/antigone_parados_summary.pdf
    • https://uploads.strikinglycdn.com/files/b8ba167f-3fb7-4954-9099-ccb66c8768d0/all_bass_clef_key_signatures.pdf
    • https://uploads.strikinglycdn.com/files/a2068670-09dd-489f-99ea-a2505348fa57/back_to_the_future_chicago_cubs.pdf
    • https://uploads.strikinglycdn.com/files/b01fde4d-afc5-4061-a511-5acbb810b2e3/funiliwuvojamevimisozutal.pdf
    • https://uploads.strikinglycdn.com/files/7a126095-96c3-46c2-a3ed-b45783fdc150/85526443712.pdf
    • https://uploads.strikinglycdn.com/files/6be103e5-b18d-402c-8c81-4e5e4980502e/samirusududezelotifisujo.pdf
    • https://uploads.strikinglycdn.com/files/bc74b2a5-d446-48cd-aad6-2e623f00e42f/44070407906.pdf
    • https://uploads.strikinglycdn.com/files/661a6a3f-c97f-4e50-8a56-17f6e5cd97fd/bawomoposaxanevajiwote.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011678.bin
0976f7e76d3e58bc92b31c76db926f86fa102b837446b6fa4b0c52429f407afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 5300 bytes
font_01_sfnt_off00012888.bin
bc044004fdd242be1324b4e9c7f0cd882852633745cf024d4b0c8abbe424baf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 11368 bytes

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