Malicious PDF — malware analysis report

Static analysis result for SHA-256 c792ca1c41171e6b…

MALICIOUS

PDF

78.6 KB Created: 2021-04-03 11:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80c508e727c365ce030af976b66872fc SHA-1: dba8b63bc4a9a8a57c1057a1e67f145d4b7de4fa SHA-256: c792ca1c41171e6b254ccc7303d71c5804d3068ddc4f64f89a225083b78a5159
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or SEO-abusive domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=grupo+calibre+50+contigo
    • https://cdn.sqhk.co/bugolajoxodu/jjVekgg/tolobebidezolamil.pdf
    • https://cdn.sqhk.co/voxedifi/gcBUTPR/gagerakerejoxogu.pdf
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/josamalagu.pdf
    • https://zelegurilu.weebly.com/uploads/1/3/1/3/131380871/5ffbcd5ce2.pdf
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6024a72b99a53.pdf
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/xipepegunoparawogida.pdf
    • https://cdn.sqhk.co/giwitosak/1jmqQhe/warlings_armageddon_jugar_online.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/2913225.pdf
    • https://cdn.sqhk.co/mogizilo/fQchoPa/30980618.pdf
    • https://static.s123-cdn-static.com/uploads/4387808/normal_5fcd9b2d3d704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juvuraguvutoxif/voremanuduvukur.pdf
    • https://s3.amazonaws.com/bogeguva/homelite_xl_chainsaw_idle_adjustment.pdf
    • https://uploads.strikinglycdn.com/files/e9794ea8-61a7-44ae-be3c-569b0f778d7b/86354735441.pdf
    • https://s3.amazonaws.com/rubidokezive/eclipse_free_windows_xp_32_bit.pdf
    • https://s3.amazonaws.com/mogedozara/9737419357.pdf
    • https://s3.amazonaws.com/pizivurapab/54201350445.pdf
    • https://s3.amazonaws.com/lomogas/12386138177.pdf
    • https://uploads.strikinglycdn.com/files/0f4b3c56-06ec-4184-81cf-8e8003e475c2/xiwomoxobosesanoju.pdf
    • https://uploads.strikinglycdn.com/files/2305f8d4-9cf3-4ff5-b40e-b7cf70364cb2/what_is_an_offer_and_acceptance_in_contract_law.pdf
    • https://uploads.strikinglycdn.com/files/1f5b1604-0b09-4ce9-bbce-d839db8eff27/xefapasirewukexiwulisomo.pdf
    • https://uploads.strikinglycdn.com/files/d2ae3e36-e36f-47aa-8010-e2ace2314236/garmin_nuvi_40lm_gps_lifetime_map_updates.pdf
    • https://s3.amazonaws.com/tometubufimopim/bunosili.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f236.bin
94990d71b680cd7c6cc6fc4cb61e2e08c7864900858d31873c7c23de47a5b628		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 5360 bytes
font_01_sfnt_off00010485.bin
3ba4bbd0cebf310a100a5f4a59bdb17580007b0b92bcdd8596d4a7f326897e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 12072 bytes

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