Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aecf2fd3a41ee74…

MALICIOUS

PDF

66.6 KB Created: 2020-12-24 19:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e0c5c6749da061f8340937faaf7c4cd SHA-1: 78641df45f16a48ec984728f2bd0df5b2a672e47 SHA-256: 6aecf2fd3a41ee74fa09c1621c8c7c0aab5cd4bf3e2e68a2aeefb2f76aff23b4
154 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 link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8232

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=bruce+lee+songs+video
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fb953c70c2da.pdf
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/9566360.pdf
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fccbbd9be68b.pdf
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/d3337873964.pdf
    • https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/radumuvugikulak.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87703279149.pdf
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f971cddc746e.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/delugituravofa.pdf
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f9bff423013f.pdf
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fd0c0d51a25d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/votawawo/frequency_table_and_bar_graph_worksheet.pdf
    • https://s3.amazonaws.com/jinotugiwomo/depukeraf.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edab.bin
995a92e8965f7ac905813eeb9949ccd2d3c0a47345ab683ec664f9d856e4ca91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 5004 bytes

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