Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db558789f6bb8a5…

MALICIOUS

PDF

68.8 KB Created: 2020-12-15 15:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5465bbb30c4831af7a83f19312525886 SHA-1: 4ef82adfe229a8d873056c1631816451b8a74a68 SHA-256: 0db558789f6bb8a5ee7ec74e17b5ae3298ff46f7d46c270453844f50a142c65a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to malicious sites or download further payloads.

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://trafftec.ru/123?utm_term=retaining+wall+design+guide+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487663/normal_5fb5ffab8e380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_5fb37bf635d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f91f728c530c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5fa85a90aac19.pdfIn PDF document text
    • https://jinerepesejo.weebly.com/uploads/1/3/4/5/134576949/879ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fa5b90383879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5fd7ba2a2d088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8856401d612.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/woseferexo.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/34161dcf-9eae-45c0-bc5e-75f9948e35e4/potitikulumazejimesiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e998cbd-8ec4-418b-984e-49e39fb73686/lijuwegep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed7e664-3035-4324-8cea-29c7e6d14e75/jumejuxivetebifomemafosi.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_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 5092 bytes
SHA-256: 47126e77ae6d7ffbae9779cd515b83ac2f3ee8590f16155ed70d1ed20ac60620
font_01_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 10032 bytes
SHA-256: b40857617afa6e01ae1c3159a78e973241c0213f4766f3cc9bb11c72a9cc8727

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