Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3d7897fc0096c9…

MALICIOUS

PDF

59.6 KB Created: 2020-12-31 08:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 56d0b1c94eb3bb86832fad0b2633aa5a SHA-1: 7e5211e8e57d628a404284154132e5cc124d5e47 SHA-256: cb3d7897fc0096c9265c730eb7255556cf5d027642a9a9d19ffd43c58950d221
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=low+rider+ringtone+for+mobile PDF link annotation
    • https://cdn.sqhk.co/zururodi/GtOjjia/galaxy_of_pen_and_paper_secret_classes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_5f9ca449ae0e0.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/golutux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fa10d9a807f5.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/350584.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/fe5da18e-1211-443d-919d-6c27fa4e1524/71552180289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04db8e6-2751-49bf-a241-0c8886023254/rpi_candidates_choice_college_confidential.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/16292340522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04245b5c-448b-4819-88b4-d50b30de9293/zapubivuvijewipufidize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fc610d-d833-49e8-9cd5-dc6bdee435da/95425035270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce41918-de3d-4bd5-9001-f5ba5b63c9f3/53367416996.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/public_policy_life_cycle.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_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 5012 bytes
SHA-256: b47dd55909599a25d763f471ba8c86e08ada22efb162aefead99a446fa2ddee7
font_01_sfnt_off0000c0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CD 9724 bytes
SHA-256: 985ef6e6c121fde53360b34353272f0a15c947ae4756ca62222f24974b6647fd

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