Malicious PDF — malware analysis report

Static analysis result for SHA-256 956f8cb4dfdc2a14…

MALICIOUS

PDF

68.2 KB Created: 2020-12-17 23:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 23fe23c5137a79fbcb2d08d06e3d7567 SHA-1: 8558f44187576bfc7cbc2ebb80afb834931fe92a SHA-256: 956f8cb4dfdc2a140409926f0c240abab73f4b32e8c7eba34f934abcebe64008
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm hosted on disposable domains. One of the primary URLs, 'https://traffset.ru/strik?utm_term=red+swamp+crayfish', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/strik?utm_term=red+swamp+crayfish PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fc6582c831c0.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/rozufagalulur.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/givup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f91d5510d5ce.pdfIn PDF document text
    • https://magozenidudib.weebly.com/uploads/1/3/4/7/134711122/06c08cd221.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/100289.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/nodetuxapabara/sixadivovinunotiwamigot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739622a5-2fed-44cb-be40-750842c5c304/harry_draco_mpreg_recs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cb22f9-975a-4f7a-90b2-8b1d6065bd4b/jibeponalisoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/vepoxajexeparukirepupez.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/53234869322.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/her2-_positive_breast_cancer_treatment_guidelines.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_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 5564 bytes
SHA-256: 598d6a7fb39d012d4c5a854a6a32d51c250c4849fb43bc3439c3e463b910a30a
font_01_sfnt_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 10824 bytes
SHA-256: 3cdd22342e29f9236cb86ec81b6bc509eab156bc9ad0384ebe6cc1cd30770642

Open this report in the interactive analyzer, or submit your own file for analysis.