Malicious PDF — malware analysis report

Static analysis result for SHA-256 3498898860cd78cc…

MALICIOUS

PDF

77.6 KB Created: 2021-06-06 18:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 452cf4ec20560c5d377789912411f49e SHA-1: afac0bf62f0878abe9ad7ba94c7c4652bbc8fdfb SHA-256: 3498898860cd78cc2dc7c209068647c1860b5e1ec8f4c6c84a9678f851d38630
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9245

Heuristics 6

  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/pbw?utm_term=stanley+fatmax+1000+directions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380073/normal_603ec59445f5a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4449012/normal_60afe5bd10b46.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450045/normal_60b37ae7bdfce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_601143ae022b8.pdfIn PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/672672.pdfIn PDF document text
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/fiveminusat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_60bc09a154968.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/gidopupunujoru_pumifulusi.pdfIn PDF document text
    • https://tadivibudup.weebly.com/uploads/1/3/4/8/134899420/2928262.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/6efef4c2-56c5-4865-b413-ffbac38a1c16/15743730166.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144419145/suvarudezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13dcc915-85bf-4428-88b3-f60a73369c63/9860325300.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144441267/what_are_some_of_the_positive_effects_of_globalization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724e6b44-6054-4492-99f1-5f2aaa5c8b2a/skyrim_se_latest_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2effad7b-269e-41c6-9297-7c13fb00709f/resefolopusununokevikosas.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/vukusotimoralowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ab309e-3fd9-4e78-81df-3e128e285825/how_much_did_paige_vanzant_make.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144633801/romeo_juliet_movie_audio_songs_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fa34bb-819b-4a5d-b8e4-149c0b4280d9/nukatelidukugoz.pdfIn PDF document text
    • http://medodadepud.pbworks.com/f/90450589221.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/64375426088.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144521427/can_you_use_bissell_crosswave_on_wood_floors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be93cb63-4c8e-40f6-9216-b24def746400/gasimukenugumorefev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0066f0-6b0a-4f3e-b769-5522fd5b895c/46514924686.pdfIn 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_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 5636 bytes
SHA-256: 53972fa5724dc5d88723fce05a176ea0f82134c80dabbe326b4a783a0cd07ce7
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 10280 bytes
SHA-256: 696d6b372d7e7f3c0b981a38061449b1d0cc6482f3f893aebf31fe9ae0ddb4ad