Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae234a8c44a58b7a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 23:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d6a2066f5e7b5356bc424f97edc203 SHA-1: 40bd00f027518c661b2d4df1715109492a406956 SHA-256: ae234a8c44a58b7af0a66c78dd1f7a1d55d81f689ed6f09e598df1967df0f288
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting it is part of an SEO link farm or a phishing campaign. The embedded URLs point to various PDF files, likely serving as lures or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=second+continental+congress+lesson+plan
    • https://cdn.sqhk.co/tirewaku/gfy8ggs/rebodopofulim.pdf
    • https://static.s123-cdn-static.com/uploads/4386594/normal_60095613ce536.pdf
    • https://cdn-cms.f-static.net/uploads/4407303/normal_603ea7fa2b59e.pdf
    • https://cdn.sqhk.co/felegabiw/idPcghI/zombie_smasher_game.pdf
    • https://cdn.sqhk.co/vemegunir/fidQ3ox/sunshine_house_resale_store_sturgeon_bay_wi.pdf
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/kugegiraruj-lapifirixitawo-narisekadola-bojomoriv.pdf
    • https://jasoveloxera.weebly.com/uploads/1/3/5/9/135967924/2d8eb9816eb.pdf
    • https://cdn.sqhk.co/savageven/UxiehiY/15463552038.pdf
    • https://cdn.sqhk.co/wumerelup/bhjZAhb/icloud_sync_apple_support.pdf
    • https://static.s123-cdn-static.com/uploads/4408866/normal_5fe336c0ac09f.pdf
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fd05a099c038.pdf
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/7399024.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601716841df4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4fb2ffd5-9005-4d91-bbd8-bca3ce5465ab/2971997464.pdf
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_f51e423d071b4da6ad99928220bf4606.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07b2290c-8ef1-41ba-a161-0da97f6ab169/the_trials_of_apollo_review.pdf
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_d0c2b45e15b143c582091e67cb7d37c6.pdf?index=true
    • 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_off0000e644.bin
49334cf81f21ff2d1382ba41ca148f9aace232299a738a53e3f240b76fc9c507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 5344 bytes
font_01_sfnt_off0000f87d.bin
86a0f9b29facc0e775d0a6bb1e1eff5c4294249d7e2b0898d7c26c6fdd6e3584		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10688 bytes

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