Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d85107989790dce…

MALICIOUS

PDF

74.3 KB Created: 2021-06-09 21:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e59379f5cc3c5b819b3263a8cf42cd SHA-1: 65bc13f71f85c8ce5da8ce61bb8d3c2048b54a03 SHA-256: 2d85107989790dce8066fd9fa07814a81197e4281fc43833ff7b82c1e4bae9e2
156 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, suggesting a phishing or SEO manipulation scheme. ClamAV detection and ML classification confirm its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://drafthe.ru/pbw?utm_term=restless+2012+watch+online
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5ff7dcc69ef91.pdf
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/dcb4a4646b.pdf
    • https://cdn-cms.f-static.net/uploads/4464534/normal_60252ee5ce977.pdf
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/15330642f4.pdf
    • https://detaliwaka.weebly.com/uploads/1/3/4/3/134340587/nusate.pdf
    • https://cdn-cms.f-static.net/uploads/4404103/normal_60421b3648a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4445745/normal_603ab558ac7c6.pdf
    • https://cdn-cms.f-static.net/uploads/4393035/normal_602a1e60a689f.pdf
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6019c5a0c4c91.pdf
    • https://cdn-cms.f-static.net/uploads/4385424/normal_605038e2a697d.pdf
    • https://static.s123-cdn-static.com/uploads/4422638/normal_5fcb5e3e83223.pdf
    • https://cdn-cms.f-static.net/uploads/4453730/normal_60610768b4537.pdf
    • https://static.s123-cdn-static.com/uploads/4404723/normal_60096bcf45f73.pdf
    • https://dadoxagowona.weebly.com/uploads/1/3/4/6/134677816/potegububiduk_turasigaposubux.pdf
    • https://cdn-cms.f-static.net/uploads/4459060/normal_604ca2a6b2970.pdf
    • https://zozajiditufex.weebly.com/uploads/1/3/5/3/135309939/5110859.pdf
    • https://bagonapibuvuxo.weebly.com/uploads/1/3/0/7/130738628/5790610.pdf
    • https://cdn-cms.f-static.net/uploads/4503692/normal_60bf41d69ee7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nijosifa.pbworks.com/w/file/fetch/144918279/counting_bugs_worksheets_for_preschoolers.pdf
    • http://xesimisejek.pbworks.com/w/file/fetch/144745719/63688494360.pdf
    • http://buvavipoluvu.pbworks.com/f/dreams_bring_back_all_the_memories_song_lyrics.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e246.bin
d74003018f72b6588a51ea0c5a734063b5c84e545450470b86ef6db66e960227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5216 bytes
font_01_sfnt_off0000f422.bin
3bb359e5f13468ef3cba5045b3636e82d3dda6878f1913f869f93eb69549275f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 11172 bytes

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