Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f323d46da7c894c…

MALICIOUS

PDF

76.4 KB Created: 2021-05-31 11:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da54ee22e1c88fa883129f913f66a282 SHA-1: 0582c5040c7e86c4330bfef89a29e1d81a72a8b6 SHA-256: 6f323d46da7c894c2da9be425d107f495c791aaa56feecaf61c2584b45a2a359
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 pointing to disposable hosting, and one primary URL that appears to be a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded links suggest an attempt to drive traffic to malicious sites under the guise of providing a study guide.

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://seumenha.ru/strik?utm_term=comptia+network%252B+mike+meyers+pdf PDF link annotation
    • https://jikanozirupeson.weebly.com/uploads/1/3/4/6/134656521/6385011.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/fujivibox-palule.pdfIn PDF document text
    • https://mavegisokelu.weebly.com/uploads/1/3/4/1/134131346/wewurazatovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fd7218f68a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_60458f0a2dbf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff827667b92d.pdfIn PDF document text
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/e0d31a95bd31942.pdfIn PDF document text
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/telizufotivo-bipitis-nurigaw.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/ea1fd8e49eed29.pdfIn PDF document text
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/torajowim-nakiduzujef-lirexidagil.pdfIn PDF document text
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/6860487.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/b899b8fe-be63-4f30-8454-636cb546eabd/31813805792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d5143d-8167-4a21-ac05-07b840db36ad/64447414514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077a387e-bf9d-4246-840f-a15fd04e87a4/36811524728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab71abaa-3228-4984-91ce-78f303803dc8/26652241331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54f7e62-8d30-4d4c-9dd7-bee21084befc/meyvecilikte_a_teknikleri_kitab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3314e0e5-e5f7-45a7-b812-8138db60e5e1/54662006671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb410f36-9451-4142-8602-82ef18619974/79697465581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850e7ba4-ecb2-4b96-8f62-920994d5a466/how_much_does_a_computer_hardware_engineer_make_a_month.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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 5316 bytes
SHA-256: 47a745efad276103d96e67f7df2d3b12ec2f6869ab1adcb51b89787e0855b19f
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 11568 bytes
SHA-256: 6e72ee7a2ee0133042f6bbbbf76699c4bb2d64398664d495531980753fcfed72