Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29ff474879b3422…

MALICIOUS

PDF

72.8 KB Created: 2021-06-10 08:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f16f5ae6929ef0b68c4b8292321fd1bf SHA-1: e100fb8a0281bab10f57852f136b39c1924f85f4 SHA-256: f29ff474879b34223b2bf503bd62a375cc1d7ca85983121d4c53da279e885ba0
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 0.9993

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://catamma.ru/pbw?utm_term=properties+of+exponents+practice+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375890/normal_6012c780bfe04.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/5235909.pdfIn PDF document text
    • https://somejokal.weebly.com/uploads/1/3/4/4/134494219/xixasedilojosi-ligovovovoteme-dotowevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_60616ee37b1d4.pdfIn PDF document text
    • https://rakidovarej.weebly.com/uploads/1/3/4/6/134685608/faluru_gemabokozexalax_nozepa.pdfIn PDF document text
    • https://wuviruwex.weebly.com/uploads/1/3/4/7/134766268/vapovid-nizudedopuwunod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_601c04715f71e.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/pakuwaj-nunofiju-lodututisejox.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/muben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_6051276734406.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/e923efa5-a21c-4e3b-a1c4-348bc59ac668/how_to_get_rid_of_red_spots_from_old_pimples.pdfIn PDF document text
    • http://pesumireg.pbworks.com/w/file/fetch/144800889/naxinijede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22ff106-348e-4795-95b2-9bbf0e296c37/dremel_400_vs_4000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604ca938-a800-4209-b633-001fcafb36b5/what_is_the_meaning_of_headship_and_submission_in_the_bible.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144639141/88818418356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39eb0bc0-c1de-49a5-a31d-e185cf40e8b1/72854353943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d058200-e8ec-4849-bf62-f7646f39b99c/libro_edipo_rey_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f33465-0817-496f-b3a0-dbbb6fa3b7f2/88873756573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d075f0c1-f56a-4c05-aeda-6b3408cf80e4/xakovowitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5252af6b-b1c3-4e9f-a610-515a68fd7a44/56301104190.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/w/file/fetch/144864849/how_does_matter_cycle_and_energy_flow_through_an_ecosystem.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144719136/reaccion_quimica_neutralizacion_acido_base.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/descargar_la_biblia_reina_valera_1960_para_mi_pc_gratis.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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 5296 bytes
SHA-256: 431ecf6b3ede49a05d576c8b0e6cf5c2f4856f296d8b295a869622190aa41bd2
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 11800 bytes
SHA-256: ac66a0b4f96e0792965e525e944d37df45be1e06084aafd1d08bee6485638e2d