Malicious PDF — malware analysis report

Static analysis result for SHA-256 100a6b751e094c87…

MALICIOUS

PDF

82.0 KB Created: 2021-04-15 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87cbf2a5eb3848a5ae4724094b9b6157 SHA-1: b5bafb3799707b86e9e7032d0fe7525f81571b64 SHA-256: 100a6b751e094c876bf38d559124fca0018384e75be6ab7e07316cd06eda2e43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://seumenha.ru/strik?utm_term=singer+futura+quartet+parts
    • https://cdn-cms.f-static.net/uploads/4389080/normal_600f03fb35268.pdf
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/zuxeduvoruvi-rarado-lasovaxu-nuwetovi.pdf
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5fe56da839bb7.pdf
    • https://cdn-cms.f-static.net/uploads/4376854/normal_603443dc242e8.pdf
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/4333615.pdf
    • https://cdn.sqhk.co/dijabidasu/jhgepyA/mma_underground_gracie_barra.pdf
    • http://bostpolamos.site/blueant_pump_wireless_headphones_manualfysao.pdf
    • https://cdn.sqhk.co/dekawako/Mwijtgi/3_tier_wire_basket_wall_shelf.pdf
    • http://50offshop.info/uk_practical_driving_test_marking_sheetidb1x.pdf
    • https://cdn.sqhk.co/wowebajix/jarjjib/robot_carnival_anime_trailer.pdf
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fd7f81ed584f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_871c8983c9354ab4938db189fa797ed6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d3323ffa-ccee-4364-8957-cf6354a581b5/zorba_the_greek_line_dance_step_sheet.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_8c9a708842864eb4b69f3febe69d027d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c79c1bc0-d570-40a9-bfc1-c16971dc0b64/how_to_check_used_car_before_buying.pdf
    • https://uploads.strikinglycdn.com/files/391baca1-2729-4ee2-a868-956d71c14a0f/82435546911.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_a8a0100e498944148d5a75d2f638a9c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0911f0c2-a214-45ae-8121-7962425e8015/boxodanunovasodivokogu.pdf
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_254fd2711ebd415ba8ec0215c0a12a4f.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6e.bin
8578f72b9a9d956220ed97c6c6a0ba9c41e54daf76ca97ed44654a143ba79d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 5264 bytes
font_01_sfnt_off0000ff63.bin
43d585edafb94f65b1bec1950c39700fafef6d45a51ca5d656afb727604f7d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 11476 bytes
font_02_sfnt_off000125b2.bin
94916db2523957c569185dc43e39b7d8e6513ef84e33c61248e8a3c36842bb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16076 bytes

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