Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4c4945ed49370e…

MALICIOUS

PDF

68.1 KB Created: 2020-11-22 16:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6cf152d17a99fafed8451f518dc36e61 SHA-1: ebc43466ea6bebe3ecb3ee9e3310dcd8ea0ea242 SHA-256: 0c4c4945ed49370e5707591d7637968aa83e7e378c34e52e81fa5827a40665ac
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'trafffi.ru/aws', suggests a link farm or a distribution point for further malicious content. The document body, though heavily obfuscated, contains references to 'script template documentary' and the authoring application 'wkhtmltopdf', which could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=script+template+documentary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5faafd20131e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f973f50aa7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5f9472541690c.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/ab33576.pdfIn PDF document text
    • https://tenasusuboziwid.weebly.com/uploads/1/3/4/3/134349012/lagevaxobojaj_gugurikorome_zufizof_mikotejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f885d5e79e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f8c3bbd34996.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/9611648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5fa4c452832b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5fae3b5908b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_5fae27e5dbb41.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/tadovu/add_ing_to_verbs.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/bless_the_lord_o_my_soul_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/foxibived.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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 5248 bytes
SHA-256: 5e4e044107ef7233ae89134403579747850142a02a241d1dc009227724fcf290
font_01_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 10684 bytes
SHA-256: f8aa3f9e4599153b8a54a293d7d701dc7efcb3ab53da16af1f014b1f6998579c

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