Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67bda47d03ee3f9…

MALICIOUS

PDF

92.8 KB Created: 2021-02-23 11:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44e782362d1de6a171734599f5c73557 SHA-1: 32277987cc6a17c8f3d4eb2ebe21115c0f66a0e4 SHA-256: e67bda47d03ee3f901e5c0566f7f6276fb20694ec6f65e9bf938499a8e47b242
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attack pattern involving directing users to potentially malicious content, likely as a first stage of a phishing or malware delivery campaign.

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://druttle.ru/123?utm_term=chicago+manual+citation+style+16th+ed PDF link annotation
    • https://nuwusiran.weebly.com/uploads/1/3/5/3/135321198/gadulus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5feebb4fb8a7d.pdfIn PDF document text
    • https://kopujigok.weebly.com/uploads/1/3/4/8/134862339/vunar.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/tudodijipapezet-magisabatufilo-dinidakiwizavi-ponukobamev.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/9270156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_602457fd9e402.pdfIn PDF document text
    • https://nulaxevaximuji.weebly.com/uploads/1/3/0/7/130776814/692977f.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/renikopokixix-luwotolifisira-lolokefusero-bijefamozikew.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/jokotaziweluge/old_anjali_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/24653241634.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/zakolajuxakuxofume.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/bavujibujiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/80541906599.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/61545791625.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_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 5472 bytes
SHA-256: b0137da3179c44d7d3ccafce292ccba2122c142d75e3d4fc15ddac850fb5d15d
font_01_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 11208 bytes
SHA-256: 545e7e0651650a9c1881328234c3394378f1c548f77716800348aa4b4dcd2431

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