Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3a1cc8d9676dfd…

MALICIOUS

PDF

74.6 KB Created: 2021-01-01 14:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 711033cdd78e3e41013c2091b064b264 SHA-1: 4d40900d2358ee03c241422d0e44aff8e7a7c97b SHA-256: ce3a1cc8d9676dfdce9af27e9d7933339bddea550be424156ae78b56dad6a77f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=best+target+archery+bows PDF link annotation
    • https://cdn.sqhk.co/gupukutolet/AtkVia3/topevebejebuzinawigo.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/Wyjcgch/43490438646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5f9f800ad071d.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/3544848.pdfIn PDF document text
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/ba0b1ae0.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/1153143.pdfIn PDF document text
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/8671678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fe82b841246a.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/91b65f41-add4-4798-93fb-b93de4310816/28162532330.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/food_and_beverage_proposal_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0b2c5a-64ee-4e31-93db-095d048455c5/rubimudut.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/75605339444.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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 5412 bytes
SHA-256: c56800a2ff46fc3d3ebab8b2d624966272ec4048329955f10c859ec5b0b05997
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10520 bytes
SHA-256: bc9777c181dbd92a88b19dc97f011781fdeabbacc6ab6f9aaecc3efb856ca834

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