Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f4673b717d003…

MALICIOUS

PDF

69.5 KB Created: 2020-11-23 15:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d7420189f608ce51eed600c4b43806 SHA-1: 753a0bbac1c4abb7ec3d51ada39274a922f4613d SHA-256: 790f4673b717d003d894e480fbc3b899d72492fd2e4e25086972bf96e7ebef7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm and an embedded URL pointing to a website that appears to be a lure for World of Warcraft Classic (Wotlk) leveling guides. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_LINK_FARM heuristic suggests the PDF is designed to generate traffic to malicious 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=wotlk+1-80+leveling+guide+horde
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f91a033ad6ac.pdf
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/jugif_nexutakidowed_falafin.pdf
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f925f12d2fe2.pdf
    • https://xurafexejigaf.weebly.com/uploads/1/3/4/5/134588012/kosoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e258a487-984d-437d-bc0d-d3a5716f19c6/tafudugopuxulitisuludiren.pdf
    • https://s3.amazonaws.com/xedobox/blue_pelican_java_lesson_15_answers.pdf
    • https://s3.amazonaws.com/falevi/viper12a_ic_data_sheet.pdf
    • https://s3.amazonaws.com/sixenogafopoj/nizepezusu.pdf
    • https://s3.amazonaws.com/xutomoxu/vijuxuwoxulo.pdf
    • https://s3.amazonaws.com/vikukinumet/craigslist_kansas_city_motorhomes.pdf
    • https://uploads.strikinglycdn.com/files/d5db42ca-f2f2-4954-b0e7-66613b9ccb13/san_juan_river_guides_utah.pdf
    • https://uploads.strikinglycdn.com/files/f231abee-f6ef-4210-97e1-5d84e7189634/34161716120.pdf
    • https://s3.amazonaws.com/bejeseja/iron_and_pseudomonas_aeruginosa_biofilm_formation.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_off0000d1e9.bin
ab45f4bd11ac09be4a3d728f025b3cfb1130eaba7caf4df3b8112f5b4cab98c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 5256 bytes
font_01_sfnt_off0000e3e1.bin
d45d6d34237b01c3f7a86d7d6823565eb5cd184ff711f9a398841c23ee24433d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 11208 bytes