Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1588db6d00aae…

MALICIOUS

PDF

71.8 KB Created: 2020-11-10 05:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 81a9eaca068e0710b959fcaefed6bdca SHA-1: dfd99204eb1608b3f03ec5edd5318764bb8ce7bd SHA-256: c4d1588db6d00aae52fae11f767dd46a69afe16971578fc8b1dc9ffc7c160063
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?keyword=remote+jobs+opportunities+az PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5fa49c4606c26.pdfIn PDF document text
    • https://dokosoberodato.weebly.com/uploads/1/3/4/5/134597138/bududamojuluvok_dekunuk_remolavedu_tuviwifadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fa3bdafe6503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fa032def066b.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/8598095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f8860d08574e.pdfIn PDF document text
    • https://sizadefo.weebly.com/uploads/1/3/4/3/134381744/derowavewuvuxeluri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8939c5947ce.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/toliwudalamem/cell_transport_concept_map_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/binet_simon_intelligence_test.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/22158283285.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/dibukenukekevuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/59154004846.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 5208 bytes
SHA-256: 4fb66a95da8a1cefbb3760de3c0f6e0468328a445859acceee94cc4a6b6d2549
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10560 bytes
SHA-256: 2c8874308a1cd3f5c41f401bb683b3dbc6e72711c250b522f3a3ee3f93629e70

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