Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc09169237b3b23…

MALICIOUS

PDF

72.6 KB Created: 2020-11-11 02:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c4bb174a33339c14a240e515c01b5541 SHA-1: 83a5ca3ed501bf264aed1df4851e463182fb9a6f SHA-256: 9fc09169237b3b23ad2756316ea56161b5eb57cb37fc17a56fad3be423c37349
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or redirection scheme. The primary URL, 'https://trafffe.ru/aws?keyword=3a+toys+noisy+boy', indicates a lure based on a search query. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely for phishing or malware distribution.

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
  • 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/aws?keyword=3a+toys+noisy+boy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419644/normal_5f9e2145d7377.pdfIn PDF document text
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/5769231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5fa89089cc67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fa3644ebdebd.pdfIn PDF document text
    • https://vaferomesab.weebly.com/uploads/1/3/4/3/134351928/d0b0d9f601f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f92c167ab521.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/norozovijalu/rigorifetazivakumi.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/18720252222.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/centipede_game_unblocked_66.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/54458440656.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/26649558297.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tudonipopodaras.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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 4864 bytes
SHA-256: 5af98409350d31c0375b611bf742b8b1c3316e4ab398148e8df926b02282e339
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 11132 bytes
SHA-256: 68de443d5a5bc9ea106fa7c38bfe8f8cdca63e4e0b0220c680dd212d477241c9

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