Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21a0fe57c73162d…

MALICIOUS

PDF

70.3 KB Created: 2021-02-19 10:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fde658a18d5836a712e404be7da4831f SHA-1: 26b238a664bf18980dd150b6d2e986fdb704ac70 SHA-256: e21a0fe57c73162d46494bd343ebf020125c8f134cf6bf9aa6fc64d6e2274150
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. ClamAV and ML classifiers strongly indicate this PDF is malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and external URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=what+is+epic+clarity+certification PDF link annotation
    • https://fuviwamirami.weebly.com/uploads/1/3/5/3/135351498/pinalidulir-tutapor-jipebiki.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/wemuzoriwoselapalabkfj8v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fc690c97e610.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ohZogez/5262665985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502464/normal_60084139896c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fceb2c3d631b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_600d98d0b071d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5feec39177fa5.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/galinikagopit/best_afro_beats_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/98163989116.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/25124544860.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 5216 bytes
SHA-256: ef4bd7b5aa77befc5fddcf3baa1001a30f5b156d56aede90bcb081d244cf787f
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 10844 bytes
SHA-256: 1045cc3adfae3d679df135d9ea38fefd01a17bb0a9d271f9fa49427863f531c4

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