Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b430e5c0926e3ac…

MALICIOUS

PDF

74.6 KB Created: 2020-12-25 10:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: af7a93202ec7ec6e69e6ad2473a83052 SHA-1: 850ec92debc55b9174e65ed1598f17a32d7edefe SHA-256: 5b430e5c0926e3aceacfe55a07984cb2bab5614c62d6f3d1b0094c83293164f7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on link farm domains. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=directv+now+guide+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f891b595e762.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/zalez.pdfIn PDF document text
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/lifef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_5fc1dbab52f52.pdfIn PDF document text
    • https://boserizozililo.weebly.com/uploads/1/3/2/6/132682878/xurakesaxij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f98a3e458ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd773d153cc2.pdfIn PDF document text
    • https://wefopizek.weebly.com/uploads/1/3/4/8/134849363/zefirizeneb.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/fobitewezavabozipome.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/f35c741d-2eb6-4a3c-9eb6-7e3c4bb4ed48/69640859842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0080397-d6cb-4235-8a80-4ef8bbe33e79/pcp_accepting_new_patients.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a776038-3b29-4470-9d08-8f339e537f64/bizurejamibavikefexeligu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ef809f-aac0-4c2f-9d9d-ce02c23d0fd8/ginetebilapo.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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 5016 bytes
SHA-256: 7ce958af78f9098682b8fdc58b129ab7b5a7da6c6ea6aea88efb528f15f839b3
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 11432 bytes
SHA-256: 1177deedcaa93f5ff3d83cdc751911f2c6dd6f532df5ffa515ceeab4d134a45f

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