Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5966b8db99f3a6…

MALICIOUS

PDF

69.3 KB Created: 2020-12-25 23:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1a11a85757c4e95678eb89f0094839d7 SHA-1: 835c5c2e62a0e0d8eb7844f7cf5438410dd2c302 SHA-256: fb5966b8db99f3a657bcdd9945563aa079c20d8ce99d27ebd5ecdf10fd27679f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or malicious redirection scheme, potentially leveraging SEO tactics to distribute malware or lead to fraudulent 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=tarzan+the+ape+man+english+movie In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fcdb42e81c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5fd669a8368d5.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/0c1c64de.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxebiseso/wjfK9yd/national_geographic_store_jewelry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fd961faefb8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcac19b41471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f8a79ef1f8e9.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/5426982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_5fbb2ab45d779.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/5fb07bb8.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/gifojuxaxeva/cover_letter_template_for_graphic_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/95126830503.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/kojagivevomumovejutefib.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/is_11255_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/14592088443.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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 5292 bytes
SHA-256: 16db575ff6bad6503c85087b9d92d08bf9b574f825dc3a4a6a47d01b5a6c7805
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 10820 bytes
SHA-256: c3bdff479dcd5c73151af8c2406e4efb90230127d9600cb06538648784ac5c79

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