Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf2c8e630034afb…

MALICIOUS

PDF

73.4 KB Created: 2021-03-16 17:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 07a58ec919d1c291fec584ddda92c860 SHA-1: e4b21caddeecba52632211ca8bd86f2277e7247b SHA-256: 5bf2c8e630034afb5e940553684e4701caad8d3f5b179b8092f255afdd516173
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to mimic search results, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent external URI, 'https://mezovuduw.ru/strik?utm_term=tecumseh+lawn+mower+engine+carburetor+diagram', suggests a lure related to technical diagrams. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

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://mezovuduw.ru/strik?utm_term=tecumseh+lawn+mower+engine+carburetor+diagram PDF link annotation
    • https://nusimilanagazi.weebly.com/uploads/1/3/1/4/131454102/8417de1b2.pdfIn PDF document text
    • http://x-bionic.shop/rheem_gas_hot_water_tank_troubleshootingmsece.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/bebukamomaramuju.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/jOujfih/state_farm_car_insurance_rate_calculator.pdfIn PDF document text
    • https://tisawotaw.weebly.com/uploads/1/3/5/9/135993845/3373b3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/igjdiai/gelikesipasuriwuwat.pdfIn PDF document text
    • https://cdn.sqhk.co/xamewivuvus/Vjc4sjf/chashme_baddoor_2013_full_movie_filmyzilla.pdfIn PDF document text
    • http://kinorio5.xyz/skyland_trail_costry3rd.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/mogedozara/a_simple_forex_trading_system_that_works.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/sejifisekatutijugatorat.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/55118485848.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/dupugumomadad.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/vuzoraxuvopiremenitefi.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/geziwonefititaxogomotofil.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/jugs_pitching_machine_parts_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/one_piece_filler_episodes_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/38291725740.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 5532 bytes
SHA-256: 0df9eaccb97bc595dc9700599c2cdc50f677aa76ca1dc17553e6f54f40fc9bcf
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 9792 bytes
SHA-256: 7a3877e45643412a0c5a9c3956830470ec07514d8a8b285d97dfa48cc2d1b2b9

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