Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57572a51f7dc793…

MALICIOUS

PDF

75.8 KB Created: 2020-11-25 01:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41b2b9ae954ec1c7796c6f73a453a690 SHA-1: 9537bba136a5208a83f81ae073843c21ca13b2db SHA-256: b57572a51f7dc7939a1a7d739e21934b76e5915225c70b5eb6e2a08aeb4c2735
214 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one URL identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a 'waterproof camera bag', suggesting a lure to disguise the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=waterproof+camera+bag In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5faadb46e2b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_5fbc7c988a38b.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/ravapav-surisosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fbd8e585f74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f984016e7153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5f9a2f7e6c388.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/7082974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f9a333eccf98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f870c32d0046.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/lupebesu/74045869477.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/87245276314.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5280 bytes
SHA-256: 0cf6170b91573a3637bf7cfd1518d0a719acd22d28450e3bf3da61906cdda7f2
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10864 bytes
SHA-256: d6bb2566842a167e2b47c61c9b5446a1155c2f0425081d48e566201e6e53bbf2

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