Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff09b085f44aaea…

MALICIOUS

PDF

79.2 KB Created: 2021-05-29 19:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad2cb8a9d2ca1f55cb4a63b9618724d0 SHA-1: 12961817ca81fcf14da521b830ad7173d13e9a93 SHA-256: 3ff09b085f44aaea6067c56e188844250b59fcc7191e391ce3537c0dba597f45
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://baarspo.ru/strik?utm_term=how+to+heal+tendonitis+in+achilles PDF link annotation
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/f66ba7ec632a.pdfIn PDF document text
    • https://nuvomananakoleg.weebly.com/uploads/1/3/1/4/131453817/jolaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_6007ec5e7cb1e.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/zaluzonoxi.pdfIn PDF document text
    • https://dexewagumaz.weebly.com/uploads/1/3/1/4/131438443/1624455.pdfIn PDF document text
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/1898310.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/66378993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_60300222925cc.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/renarukumopaxi-junuzofavexoje-wisoxuligim-lelosopemeperem.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/botuxow.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/5104276.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/1898174.pdfIn PDF document text
    • https://loxujuzif.weebly.com/uploads/1/3/4/3/134368844/96ba142bd.pdfIn PDF document text
    • https://jezugazaditok.weebly.com/uploads/1/3/4/6/134601365/zasotiguxakates_rifosolig_tijukodugopavu.pdfIn PDF document text
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/744b67e0a.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/7dbf6655-cd62-417c-962d-8543408a6b45/65753934082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad6b88e-5eac-46f3-9036-cb685a5e5ab8/vazepogijafos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b5fa8d-f6d0-4b7b-b78c-29abc821d552/zizawotetediwiruzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e9f704-bb3c-4ede-b90b-d0e622bec923/95197555989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9d8f44-b48d-4a09-b1dc-7654e44a1b50/mini_football_field_goal_post.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b23865-74db-433f-bd84-2539d116dea8/computer_networking_problems_and_solutions_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387de556-c776-4466-94af-0e74ecb6175e/waynesboro_ms_drivers_license_office_hours.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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 4984 bytes
SHA-256: 3ce8ea6f1d26a12a5ce0a0bb9214c47df5f88d363af50c49f479504048909bd9
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 10720 bytes
SHA-256: 73343f57d861ceb2d5aa0d5ab43c69810f1fc0c37bd6f56f1a82cc9698bf1d06