Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb28fb04eda73f79…

MALICIOUS

PDF

73.8 KB Created: 2020-12-17 05:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: db9afc9bd976c7b8eb8f265166ad85a2 SHA-1: 89576f47dc7557529d1c80950787ef77437759dd SHA-256: cb28fb04eda73f79e22ce1c3bf3cd2d61f16ae39199d379511e92cec38fd2599
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one pointing to a suspicious domain 'traffset.ru'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains a phrase that could be used as a lure. The presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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/strik?utm_term=this+could+be+us+but+you+playing+meme+meaning PDF link annotation
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/sezuv_sekobigifilamik_suzib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/aa4d2f8c-39a2-456b-8afe-f3ba21b67930/flight_gear_hp_ipad_mini_bi-fold_kneeboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9f1b43-8b03-41cd-abc9-f441be5c1472/sizixader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e058fa9d-0a9c-4fd2-bc92-73a78d5936cd/1416276213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd8b6b7-eaa3-4e6c-8adb-a2d09ca274a1/wind_waker_gamecube_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/luxikakizatifurusu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/22276079607.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/wenuxeritogomox.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/11662649887.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 5464 bytes
SHA-256: a46b4cc4f14766bbc7b2c6a5864b3503d50c9aadf7dff91c6759ba4d2f72450e
font_01_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 11024 bytes
SHA-256: 72b1f74ca714f141f97e62b247ebfb856376dfd2b388902caf14b1f709b1a1f9
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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