Malicious PDF — malware analysis report

Static analysis result for SHA-256 7368844c1e361704…

MALICIOUS

PDF

72.6 KB Created: 2020-11-19 08:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f374c2b475776946875acbb0368382c SHA-1: 37e4621770b766e6f6f1a5f26a0c40224893a18a SHA-256: 7368844c1e361704f457b541bd7dfb881ddc36ba83fc156d3cc8f394b39ef2da
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 as a PDF link farm, suggesting a phishing or content distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://traffnew.ru/123?utm_term=paradise+island+mod+apk+revdl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413236/normal_5f948d0f9ca37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5fa496d1213b1.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/3087717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5fb555be61d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f8b83518cb3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fad6a026aef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_5fad906869b24.pdfIn PDF document text
    • https://xelabuxu.weebly.com/uploads/1/3/4/2/134235382/4295d3dc249a0.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/8647159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5f99c79c4569c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_5f9f648dc730f.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/timafatafej/paxaxebuwokinag.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 5228 bytes
SHA-256: 96b2f5d52ab43646a13126082d7d3d6dafc91f236df8e907460f6d1fc2437d2a
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 10804 bytes
SHA-256: facb08366234c1d79e58284efa5ac05c45d2c5e35d41556557183e2921cf6397
font_02_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 16316 bytes
SHA-256: 43c1ee616dc3be43b5b024fbb240f2c1c65d323ab86308c39a248d24909b890d

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