Malicious PDF — malware analysis report

Static analysis result for SHA-256 04124b020c17b77d…

MALICIOUS

PDF

58.5 KB Created: 2020-11-24 21:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4973a62ba330836866168a7ba9ff34c9 SHA-1: 266fbca7b077e6deb154ad66820c4ac8027be2c4 SHA-256: 04124b020c17b77d00b992534f630b6efe7e04bb35bd35a832dbf6a2d4b32713
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that exhibits characteristics of a link farm, with a heuristic indicating a mass of external PDF links. It also contains an embedded URL pointing to a suspicious domain. ClamAV and an ML classifier flagged this file as malicious, suggesting it's part of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://trafffe.ru/strik?utm_term=ice+rod+case+sail PDF link annotation
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/b45573a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f9106a2152d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f93546417a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8d6a24b2bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f8aef0ea7877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_5f9993adab726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5fa7ef0de74f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8c735e43e19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_5fb7595a31011.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/lixuduwonifa/66204177042.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/what_are_your_childs_learning_strengths.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/what_are_hit_dice.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/lawozixin.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/7217815614.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_off0000aa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1F 4872 bytes
SHA-256: f89b60ddc3b8aa5eea2f3fec28e0daf9a89cd41c42453d1860b29e695118db5f
font_01_sfnt_off0000bab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 9792 bytes
SHA-256: 3270263795feab5f7d95e321a45d0edabb9c389409b94d71a408be25165cdc1d

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