Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd8a1dc19664083…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 03:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e8daa43f6b0ab180d5cb32c4fd5e635 SHA-1: d874dd732e8e8637df534946697b1c7f186bdf22 SHA-256: 0cd8a1dc1966408336696a9fe4bf2766c8d290d95718b380d7d5ee3d4572af38
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('resalured.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification. The embedded content, though heavily obfuscated, likely serves as a lure to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://resalured.ru/award?keyword=general+awareness+books+for+bank+exams+pdf PDF link annotation
    • http://hhizmet.com/xudomo4nfpx.pdfIn PDF document text
    • http://thecabinets.xyz/20467204446dtgfh.pdfIn PDF document text
    • http://artdebug.site/alla_prima_oil_painting_techniquesdcfvo.pdfIn PDF document text
    • http://dlkmvkoenv.info/diratalakopobesorikurisa0n9o2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_603eeb0fa1278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5fd92d907d2a1.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/rogibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_603e0d086e52b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_c6fb4a4361ca43ab88e3399be870a9b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/can_i_use_roku_remote_app_without_wifi.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_2d9d41ba5b404d909e71d6263b23c045.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b08a3c-2b05-4624-b048-551739f02d7a/free_printable_christmas_family_feud_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/85560526577.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_e78a36e21fd44c50a2947a7efa577ea1.pdf?index=trueIn PDF document text
    • http://bibalaluroxute.epizy.com/grade_8_math_review_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/984d5299-9576-4e7a-9c96-5c2cd8afe8b9/agatha_christie_five_complete_hercule_poirot_novels.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_54e92c5fada34ba1861788a89c160e47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9304ca85-7069-49f1-a9ee-3e497ff9d3c1/migejigizivos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef707899-bc62-4d2c-a832-72f45c451526/abu_dhabi_mall_vox_cinema_contact_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19830b64-37a9-4abc-ab61-682d46892b41/zopomaximezopositefugawor.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_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 5584 bytes
SHA-256: 98bd7b9986a881c253946ef87273a3b91881d15b5163a2f709847c6ae6e3cc5d
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 11156 bytes
SHA-256: cbe16e9bed3d1e60426b812c3182571e1411e759632447ce31442ab0f64c5682

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