Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ed5914cfe0bd7f…

MALICIOUS

PDF

69.5 KB Created: 2021-01-18 08:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1e35af2bfe4a8a11890a999e63dacfa8 SHA-1: d01283677a790259c36543afe5901023bf58b8cb SHA-256: f5ed5914cfe0bd7f61a9fa565a6acbf15e1be0a0b4c355e6a4553498fd77485b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=probability+worksheets+with+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/lisutovudaf/ftljfge/bantam_chickens_for_sale_near_me.pdfIn PDF document text
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/13556e4f12d60f3.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/hiwGije/arena_football_road_to_glory_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dejegekonula/dPphhtF/xibojorenolumuxidufekevaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f92c2e38e044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fbc6715922d3.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/widiku/vakufesinekodejivadepap.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/vofijaroviruzupege.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/64957092829.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/dirt_bike_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/nupijamilasafifipol.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/general_district_court_case_information_system_va.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/battle_cats_mod_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/bhagava_rang_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/56194920880.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/download_app_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/4th_grade_common_core_math_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/woguzexasamexelikunug.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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 5528 bytes
SHA-256: b27bf133737bbf73998b4e87eaa9790b0357d50cee3d4aa3c75ad62086150d42
font_01_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 10496 bytes
SHA-256: e833b9c3a5bda60e829cc2fd8f7678b2efc1ec40eca0bfd97b1afbb9fd9beb3b

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