Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f023528f1a429b7…

MALICIOUS

PDF

70.9 KB Created: 2020-12-24 19:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 312346089023261adfe64d6b9ec47166 SHA-1: 102243ce1ad61c3c175afd63807e209a99489f56 SHA-256: 8f023528f1a429b7fab24a5b1b74ef0815abb51e7b7c753e1b57cae2c59044a5
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as a credential phishing lure impersonating iCloud. It contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to host phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gurewuba.weebly.com/uploads/1/3/4/8/134892349/wuxuletunulevuzu.pdf.
  • 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://trafficel.ru/strik?utm_term=sim+card+information+transfer PDF link annotation
    • https://cdn.sqhk.co/waximanodif/giSgfRd/9817224176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8d6dad9fe69.pdfIn PDF document text
    • https://gurewuba.weebly.com/uploads/1/3/4/8/134892349/wuxuletunulevuzu.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/d06d7e15035eb.pdfIn PDF document text
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/sewokebeg_xanizipet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fdef3c4d02c1.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/ccef13c64f5ca.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/bejogu-sitakolozapoxo-pugazekel-doxavapefe.pdfIn PDF document text
    • https://golobixapisiz.weebly.com/uploads/1/3/4/6/134653183/8719775.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/dide8je/the_coupon_boutique.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/nuxulikiwab/alone_2015_full_movie_filmywap.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_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 5236 bytes
SHA-256: 3b9abb8d1e2a4d3c3a2a9cdb18b6edd56e22795fccd82e58f933a2daf640b354
font_01_sfnt_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 10180 bytes
SHA-256: a60e6225cf7bb5e8d463b684a4cf3081b5a4c17e37e9eafac1a09cb4e9025ca6

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