Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd98a8bf1a01b3f…

MALICIOUS

PDF

73.2 KB Created: 2020-12-05 13:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 24f1853d870eab668f09a280b1d2a159 SHA-1: 695fd82c8d55bd36357e4698894bfcf3730c4875 SHA-256: afd98a8bf1a01b3f9de1570d65bc0a1fbabd053959883685cd9fe9cb57ad44bd
214 Risk Score

Malware Insights

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

The PDF document is disguised as a technical cheat sheet but contains numerous links to external PDFs, many of which are hosted on redirector infrastructure. This suggests a link farm or phishing campaign designed to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=azure+log+analytics+query+language+cheat+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5fb83c7103246.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/tidudawedes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f88d1f4b503e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fb47174a0f81.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/potewidujipetopeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5fa0bd3779132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f91547d62c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5fa307cba9feb.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/5095672.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/jolunenafobuw/24761352728.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/61048088548.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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 5328 bytes
SHA-256: 29b8467cf442ad9a80e1514dfaaa0c59573b6b96654842e8a18d35b8f302a68b
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 11808 bytes
SHA-256: c93437b7b646abdb6b078b5f775ad852108c78b282dc6ff53078578caae7ea54

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