Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c28ba6c25140ce…

MALICIOUS

PDF

59.1 KB Created: 2021-02-13 20:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4d69e7a2d78bb85b1c37ff5223f11e54 SHA-1: 3ded39a7689278e0b38e336b7a9d6d0e73bfa82d SHA-256: 50c28ba6c25140ceff4d88e8b6c8ecca4df4ff871fee0283ee64edb3876a4f18
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7166

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/aws?utm_term=twitter+lite+apk+apkmirror PDF link annotation
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/pubaf-rumodezarunanol-dowab.pdfIn PDF document text
    • https://xemexetizepe.weebly.com/uploads/1/3/6/0/136094173/bakatu_vimozupeme.pdfIn PDF document text
    • http://sudiwemubitep.22web.org/81080942070.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/8019668.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/gimijabunub.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/gcvOjie/troll_face_quest_internet_memes_level_21.pdfIn PDF document text
    • https://sedeberelaniku.weebly.com/uploads/1/3/6/0/136030724/d3fc6b0b2.pdfIn PDF document text
    • http://ruperamumafuvaz.22web.org/8654343608.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/fosawef/bubble_sheet_mask_sugu.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/dm_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/chandrayaan_2_isro_information_in_english.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 4892 bytes
SHA-256: 10f9f75e4a9150daf3c070fe5115bd1e0a4c5f23ccc71f3ccf6a90bd86211521

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