Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b75af7790ade78…

MALICIOUS

PDF

105.6 KB Created: 2021-03-24 22:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ae34e5312f54b60c060ae9875e76435b SHA-1: 206fb58b316f1f84b38f639e7e5beb3158c54dd9 SHA-256: 25b75af7790ade78f661209164a93a19dd57340ceef73690aefc3ca9134d658e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous external URIs point towards a phishing or malicious redirection attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://kuzutuzo.ru/award?keyword=bonfiglioli+catalogue+pdf PDF link annotation
    • http://benikovumur.iblogger.org/is_the_dmv_open_in_schenectady.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/a70286f55.pdfIn PDF document text
    • https://juxokiwi.weebly.com/uploads/1/3/4/5/134594748/5923849.pdfIn PDF document text
    • https://kanefudejezem.weebly.com/uploads/1/3/6/0/136056225/faxivapuzenuso_gaxavefijex_beroz_zakuwi.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/jalamoninejoripojuperigu.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/masoludawakeviz.pdfIn PDF document text
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/tifepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/breather_colour_in_transformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f415675d-a893-4b28-92d8-daafdb3fe3e7/bupufeworulafopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15daae5f-4b93-4841-93cb-1e8d13bdf7ae/genius_g750_charger_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c780414-def4-4c23-a297-fd5e407b2c3f/strong_curves_book_review.pdfIn PDF document text
    • http://gatezuzemup.epizy.com/54401539031.pdfIn PDF document text
    • http://pilivizelonula.epizy.com/import_export_canada_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71b984a-d17b-4c12-aa74-d39cea2fefa1/kizugigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc9ba82-dd0a-4f38-9e4e-c3992ad0c0ea/zovodakofefokejigovunux.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/checksum_transformation_in_ssis_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092d5149-470a-4a26-8c05-b9da607078a0/80313321553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ea927f-7a7c-47e5-beaa-0327792d8cfc/86557942361.pdfIn PDF document text
    • http://tinozireru.epizy.com/blackjack_card_counting_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/84010069625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65edc7b-1168-4d2b-b332-e8d9c1303c60/vanerepifaguz.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_off0001625a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625A 5096 bytes
SHA-256: 48ea8a8f6d2a05fa339a7379daff0de678f81947a00982bcd702ea754c6d47d0
font_01_sfnt_off000173d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D0 10384 bytes
SHA-256: da33a78d728452bd714bca42ece272b83e314467202fa622ca788a5dd754f62e