Malicious PDF — malware analysis report

Static analysis result for SHA-256 414597ab92a71fbd…

MALICIOUS

PDF

68.7 KB Created: 2020-12-15 16:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fab6148c854801cca19d58d0bcac8a79 SHA-1: 226c0b977de8e5301b52d805f6128f5ac451a93b SHA-256: 414597ab92a71fbd7f1d1a0bd225b07622cb415db915774ab8e05404cd0a6980
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary URL pointing to a page that appears to be a lure for scientific paper authorship. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=authorship+guidelines+for+scientific+papers PDF link annotation
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/f1966f43b211f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fcb1c618c2a8.pdfIn PDF document text
    • https://lodobimamavudug.weebly.com/uploads/1/3/4/3/134306091/lifezoxuduxud.pdfIn PDF document text
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/wegusolurolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5faa13bcaff4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fa343905bc1c.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/3853011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5faac3c387805.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/nowokil/kumozinamatupafoj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd1e0c89e1c4b8fb81223/t/5fc38e074e98326c027f3c1c/1606651399901/biology_unit_1_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/afgan_bukan_cinta_biasa_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/xizikuvunufixipiwokolax.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/16649340590.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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 5408 bytes
SHA-256: 2776f6e92ca1f630f4c64d3e6b675184d779354df7c76335ca974d956ffedfa6
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 10144 bytes
SHA-256: 64879d1d3938d9b333663a5a2dbee54ea2f9405859025405e36d9455a17bb699

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