Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d28db733d612b7…

MALICIOUS

PDF

83.7 KB Created: 2021-03-24 07:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 911c56cad2c019a941ec39298da3ab47 SHA-1: 74407aff543e19f9bb8bec00cf7578fbb5bc01fa SHA-256: 01d28db733d612b7a68b88634f27508fc4d987192b3bb0aeafeaf57ea8b038ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=the+everything+learning+german+book+pdf PDF link annotation
    • https://nulokedebuzeb.weebly.com/uploads/1/3/4/3/134310318/niwegonabapibu-vowamatodoviruk-siwagejazev-peforezifuw.pdfIn PDF document text
    • https://siviwoxepigomuz.weebly.com/uploads/1/3/0/7/130739754/d29dafa50.pdfIn PDF document text
    • https://lopomibuliwipa.weebly.com/uploads/1/3/1/3/131381919/webusadefis.pdfIn PDF document text
    • http://navalny.design/bizejewunugimilovcvzq5.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/how_to_descale_cuisinart_single_servefb33m.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/kuzisupepuposet.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/5583796.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/7ba3007d717.pdfIn PDF document text
    • https://tujewadis.weebly.com/uploads/1/3/5/3/135312055/89027b368a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/4450244974.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/24156754766.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/bean_planting_guide_australia.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/92223193814.pdfIn PDF document text
    • http://gomugugagaf.onlinewebshop.net/ap_sachivalayam_exam_model_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6b1c0e-3dd9-4f1f-af11-29eec35d66ee/66148395832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9aee8c-c9b8-420a-8ea2-d046f4aff539/the_narrative_life_of_frederick_douglass_an_american_slave.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/70881459371.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 5380 bytes
SHA-256: 766f3a5ec3b48b8bd8e34e9f38984ce33015be39b327bbac8f232512fdffcc72
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 11532 bytes
SHA-256: 3dcded65b430321f08a7e53730d37f62e987fe80352e9275362dfb9f4838d8e8
font_02_sfnt_off000133f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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