Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5859a88ae64bd5…

MALICIOUS

PDF

72.6 KB Created: 2021-05-30 17:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1ec3e66887e130272c5fb163759a29cf SHA-1: 2779a69b50cff34f4e7246eecf59ca1690bfccb5 SHA-256: 5f5859a88ae64bd578d1b2563dbca3f850e0bb50978075b47e77d2c2817d85a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

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://jacksth.ru/123?utm_term=embedded+video++android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387242/normal_60295efb51b48.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/fekivovesome.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/1907297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368953/normal_5ff466860d531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fcc07cec3870.pdfIn PDF document text
    • https://gomigara.weebly.com/uploads/1/3/4/7/134727279/8133769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fcdaa1ce7a81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fde7f04c17bd.pdfIn PDF document text
    • https://selewoxad.weebly.com/uploads/1/3/4/5/134523288/6500744.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/9868127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_6025bc717467f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_600b034d16c8f.pdfIn PDF document text
    • https://tujiwukof.weebly.com/uploads/1/3/4/5/134592642/xezibixogaxodezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_600e9f0cc98da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_604a3183b18b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_606df3c74bce1.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/b0983c3d-5159-4673-8228-9ae543af2c7c/pixoduzuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecafab8c-4e36-4c02-885d-4d37416cbeb8/97442022780.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 4920 bytes
SHA-256: a34b4b3e6630224d284b14b980232150adce798469d537e0493f29b435671828
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10756 bytes
SHA-256: 3d6148fedc3e37dab6ff5b574270d395c2e249963b5afbcbbc311f4bdd578bb8

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