Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd50f91233e7ed0…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 21:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 12997aafb0cc9070137a3b65a11d2390 SHA-1: b97889bbf3c58f0e63728c2f91ded790e0edf85f SHA-256: abd50f91233e7ed0b2f6a6bbe5990541e02b9eca265d43a80d7e6ff018629464
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://fokemale.ru/strik?utm_term=logitech+x-540+an+tv+anschlie%25C3%259Fen PDF link annotation
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/5641169.pdfIn PDF document text
    • http://organicnu.info/58555085062vsh82.pdfIn PDF document text
    • http://erogan-oficial.site/48259905752jxj88.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://odemebayisitrafik.com/xolulenodoferaku0.pdfIn PDF document text
    • http://jsexj.fun/buwatuwr7zu2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6016e28a1646e.pdfIn PDF document text
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/fifazutexija.pdfIn PDF document text
    • https://vebipebetas.weebly.com/uploads/1/3/4/0/134012388/9394264.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/2408367.pdfIn PDF document text
    • http://probmaka.tech/ohio_state_university_medical_campus_mapcydxl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_601c9942efe27.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/9e28cf21-75b3-43d5-992f-a2b6df952596/mr_coffee_12_cup_switch_coffeemaker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee3b112-681e-4f92-a3e9-342c940bd90f/gps_garmin_oregon_650_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cba295-98e0-4257-9a3d-05613b2fdcb3/which_printer_is_best_for_photos_inkjet_or_laser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78878d86-6e82-491e-8576-2df6594a1469/solving_quadratic_equations_by_factoring_matching_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852438de-92a5-4e1c-8b06-0d980274302f/unitedhealthcare_mississippican_prior_authorization_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868624d4-bea4-4963-be6e-6a1341aa3ae1/labudiwupijojenazabez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec88d426-261b-4a8b-8579-ef05c1aafa1b/spanish_to_english_translation_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9119e93-79dd-4899-94eb-d8ed16929e67/graphic_design_portfolio_template_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea39994-6e6e-464d-a77b-5d73d4b9f5e5/all_american_boys_summary.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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 5624 bytes
SHA-256: 4f45310834ce08634d652ba1fcae2edb8bb9f788a2486fc48d4b68a0e6a049de
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 12300 bytes
SHA-256: a12862e8a77bd3cf3cb0c48fd7882dd3424b3844ec273fa37cf004c77cbc64c1