Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7862f17a9ae1ec…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 12:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889f8d56b32fe42169dc035b4a63764a SHA-1: 1b4f94f0ae05334a91fcf7c58184220d86cc4177 SHA-256: 7b7862f17a9ae1ec055a90127efe84ac0084438c81a56f45811a37efd687d6f6
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to unknown or potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier also flag this as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=diplomov%25C3%25A1+pr%25C3%25A1ce+pdf+mu
    • http://zifeladawu.scienceontheweb.net/48564812522.pdf
    • http://siviveko.getenjoyment.net/how_to_use_remote_starter_mazda_3.pdf
    • https://cdn-cms.f-static.net/uploads/4449170/normal_60308e9479b53.pdf
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5ffe436cd3477.pdf
    • https://cdn-cms.f-static.net/uploads/4494657/normal_6040f1f1bb4f6.pdf
    • http://neditaxuvim.getenjoyment.net/bulletproof_diet_italiano.pdf
    • http://xutexukoxobofi.mywebcommunity.org/bhagavad_gita_full_in_telugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed1d5de2-eda2-435b-8f69-771f38f00b32/how_to_change_my_address_on_my_georgia_drivers_license.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_268dd1f4546a4e6aaf2fc4c99aff2415.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_5702dec0bcf84e1286d01d2875a739e1.pdf?index=true
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_b8e861ed8e78442da858e3b13cca336c.pdf?index=true
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_4d1c3afdc1aa4a88956654df471168d5.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_995c2dde8c0e4f348859ed18c22ba135.pdf?index=true
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_26695652c73e4edd845249d5e6846af8.pdf?index=true
    • http://rewuwuja.onlinewebshop.net/19602122758.pdf
    • https://uploads.strikinglycdn.com/files/1a1d68d3-7bbe-44bd-ae04-99e379417572/83855955038.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_62d5c925278e445e806c1016bd1a5451.pdf?index=true
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_6592a8ba51bb4b01838c2bab6a71750f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cec1da2f-09e3-403d-a3de-65f3d271e178/lights_out_summer_tour_2019_chase_hudson.pdf
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_5cd326fe6a12417bb3cd0737f0fc0b13.pdf?index=true
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_a4e3882143f7492ba08851178b904720.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_c20778be707147959731236dee784feb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9decf113-0db8-436f-829f-77a77fa54a8a/kusofepesarudezoxijesinum.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_off0000ed02.bin
60d17b9b471f003a3cae0756f1361b0be0fbacd7b57990937447fffbb9bc3d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 5204 bytes
font_01_sfnt_off0000feab.bin
ac463d1589fd5535720a52c6c82f9b44da0abc13415a03b233dc4ad68761091c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 13740 bytes

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