Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c0dd86f7dda5f9…

MALICIOUS

PDF

70.8 KB Created: 2021-02-23 23:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 780d0112a2abb58e6c674721bc9fdcd0 SHA-1: 7c51d62366374cac31b9289af0dda0f4d8d4be1c SHA-256: 73c0dd86f7dda5f95e1eaa41ca2dd5d4921828387440fad97d4f46db5dd8715a
156 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to a URL related to 'tax charts'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://seumenha.ru/strik?utm_term=8.25+percent+tax+chart
    • https://cdn-cms.f-static.net/uploads/4369916/normal_601dfa127013e.pdf
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ff3621ce6b3c.pdf
    • http://reduslimitaly-ufficiale.website/drive_safe_and_save5j9ul.pdf
    • https://static.s123-cdn-static.com/uploads/4367273/normal_5ffc8db5e435d.pdf
    • https://cdn-cms.f-static.net/uploads/4366662/normal_603103819047a.pdf
    • https://cdn-cms.f-static.net/uploads/4402520/normal_600e5ee564f66.pdf
    • http://getallcreditscores.info/356358386354i4m9.pdf
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/ralumage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorobukasawituw/video_of_otedola_bridge_fire.pdf
    • https://s3.amazonaws.com/zufojadibi/52563836781.pdf
    • https://s3.amazonaws.com/roxawo/dell_latitude_7490_data_sheet.pdf
    • https://s3.amazonaws.com/muvazi/how_to_check_vent_on_kenmore_dryer.pdf
    • https://s3.amazonaws.com/bogijexu/brain_teaser_maths_puzzles_with_answers.pdf
    • https://s3.amazonaws.com/degagaziv/full_hd_cb_edits_background.pdf
    • https://s3.amazonaws.com/samopakamefap/amazon_riddles_quiz_questions_and_answers.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_off0000d78e.bin
f4e7492724aae9203a3c266ec3f49da04d2d6b94e329f9123263877328c21010
pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 5264 bytes
font_01_sfnt_off0000e97f.bin
525a87a5f8ab78893120671f20935ace793fa9d48b29430ab43da62341997f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 10844 bytes