Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53011e311cb278e…

MALICIOUS

PDF

76.4 KB Created: 2021-01-11 03:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4edde36095ef2fbae9016542d0011293 SHA-1: 75cdb17ea3edd9d45e4610ec7761217ed8066fe1 SHA-256: d53011e311cb278e826e5089fa81d19e9750628eaa39c0de45737f49cf992c18
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'traffset.ru'. This suggests the document is designed to redirect users to potentially malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

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://traffset.ru/123?utm_term=runmus+gaming+headset+drivers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fd3821796b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fd16e7817eae.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/rezatitanik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f91e7716adf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_5fabf663bd19e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fc85a398d712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fcbecbbb1f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_5fb8ad3478b2d.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/pazifetanegapu/gasutemofikekesat.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/ahlat_aac_kitap.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/30724798775.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/93139347733.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/gotax.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/bwv_582_sheet_music.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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 5276 bytes
SHA-256: d5157ab961711882521d659135ba69a92927972aabdb355bdb59ec058eb0bb73
font_01_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10548 bytes
SHA-256: 5cee31c9c27a3b95a6f5a877a96dbbd4d14b59f1d8fc0cc3f2dee455fa6bbaf2

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