Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c91395038abe1f4…

MALICIOUS

PDF

73.1 KB Created: 2021-01-24 11:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 412cb66946738ce38c97aae3daaf3e3c SHA-1: b2f20aea9bb49c3db32fa68caebe557411209e82 SHA-256: 6c91395038abe1f4fa2b7069db4fc131247ceb04ac748e1fa953a85a365a5f9a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update. The presence of numerous external links, including one pointing to 'jottigo.ru', suggests a potential attempt to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/aws?utm_term=google+chrome+68+portable
    • https://cdn.sqhk.co/jarebomu/ijbrjMF/62812090531.pdf
    • https://cdn.sqhk.co/potiribuwuf/eN4ibn2/iron_it_out_idiom.pdf
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/991cf8c30e964.pdf
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/zomij_turep.pdf
    • https://kujufilobi.weebly.com/uploads/1/3/1/4/131482850/xukexidibijolu-biwere-vixenir.pdf
    • https://vomenipof.weebly.com/uploads/1/3/4/5/134585177/rugivurinot.pdf
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/1334275.pdf
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/guzixixive-nudowataxug-vomotutojerat-bemotefuwad.pdf
    • https://lusekovipe.weebly.com/uploads/1/3/4/2/134234723/valajukuviket.pdf
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/gaxesabiwujo.pdf
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/3104963.pdf
    • https://cdn.sqhk.co/mojerakikav/ihaieid/guide_for_among_us_imposter_mod_apk.pdf
    • https://cdn.sqhk.co/sulubejes/hdijNic/ship_games_simulator_professional_v2._0.pdf
    • https://cdn.sqhk.co/wezupobuwab/tRQiahd/used_police_emergency_lights_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadedosi/camtasia_studio_gratis_italiano.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/movedajofupadirilol.pdf
    • https://s3.amazonaws.com/voxazedisula/windows_7_professional_activator_key_free.pdf
    • https://s3.amazonaws.com/wixatax/arranged_marriage_interview_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_off0000e07b.bin
12f559f2d7210620b03376d4abe4e3a8f8f202d7fe2c6ae23d1fab27e7ffc6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 5688 bytes
font_01_sfnt_off0000f39f.bin
ede9e49fb31d12d192fbeba81e0244b0dfae507303411223b69f4d4cb2fe9327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10444 bytes

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