Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaa3e573c773c73…

MALICIOUS

PDF

65.1 KB Created: 2021-02-15 19:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9ae980dcfb429cd1b81fbf2c535678df SHA-1: 34a5f758f8a57b83b28e032eba55bb74caa7965b SHA-256: fdaa3e573c773c73927a3c48dd5fb3ca164ad256aec310e716e62bb6c36b03ab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to S3 buckets, suggesting a link farm or a method to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent. While the document body is heavily obfuscated, the presence of external URIs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware distribution scheme.

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://seumenha.ru/123?utm_term=braun+exactemp+ear+thermometer PDF link annotation
    • https://cdn.sqhk.co/parabeset/fKghjjk/vimotikukonegu.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/zufidikilibe_diluvurebajid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_60250fe3a5b62.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/gbjdO6y/vonenilosugepam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5fd02bb68ba93.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/dutimajizowa/sujakuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/tojatekemuzekij.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/67849127482.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/formation_en_alternance_universite_de_nantes.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/18130856290.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/repton_hymn_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/donosowerawiboziv.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/xukorebavenebisidopuwazi.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_off0000c21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21A 5080 bytes
SHA-256: 73122cafc2fefcc5f4d56742d9c5917576447fced5f467c5d110caf5b1d9f166
font_01_sfnt_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 10580 bytes
SHA-256: e76e640be114b992b47638b51b9aeb4770bc5726c1518ddf8939e844d01e44c8

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