Malicious PDF — malware analysis report

Static analysis result for SHA-256 d429955e2a4bbfee…

MALICIOUS

PDF

88.9 KB Created: 2021-04-08 00:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dcc22006f721cdfd21d9edbd34038b92 SHA-1: 7e8571348b3a78206c7f4593bd927f692dcfee18 SHA-256: d429955e2a4bbfee2933751bb97e7e50ceed996c7f70b605ab65e56a347aacfd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=the+lion+king+cartoon+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501656/normal_60383428ad7a8.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/hbhdqij/devap.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/65466058705fbffh.pdfIn PDF document text
    • https://cdn.sqhk.co/sowovupo/jagiX9V/34050134136.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/zqsS6jc/nintendo_switch_console_walmart_sku.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/jcfI8gc/jagejilazagumuluzanex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_602043b9d8f3c.pdfIn PDF document text
    • http://discovljzg.fun/fulovuvuzupaxigafasirezujinw69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_602e443bc8a5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fc68a95da1bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/509cb257-e50a-4ad4-a8dd-fa201865ae35/96440187933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a999fcb3-8c3f-46fd-be4c-eb26a713a2d4/33018199072.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_e7a6773d86a545ad9a75c016b9005288.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_b7cb3e2f1f39405fa7d500610fdb6c1a.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_51f39154b1b243c7ab0b3ba76b5cce23.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_4e3673f370e548cfaef269048560a439.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_4da4e0fdedf04a0e959f84e439029f7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b72ccf2-7e04-4a9c-9cc2-6cd0419613cb/myers_briggs_types.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_9588669ed6e24706a23636001faf2313.pdf?index=trueIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_bf3aaea982394ccf8f7c841b3b3a2e73.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_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 5108 bytes
SHA-256: 2c286123a37ea5440711131c0589a3d1dac099edc66511ac8bae0176c196dacb
font_01_sfnt_off00012fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 11596 bytes
SHA-256: d0dfdf2b824702125a09cfc1201b3e7f48354280e00026b5a5e8d62d96ee53c4