Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6b6e1e2f853bdc…

MALICIOUS

PDF

74.3 KB Created: 2021-03-01 00:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eee67588698537178ef9bf198bcd68c6 SHA-1: 4b9b491d42190dc1fa5a62db87019589ab21afae SHA-256: 3c6b6e1e2f853bdc2a0c0d86d422bd57a7019547b774b51c9c59b667d8ee8d17
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan activity. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to potentially harmful URLs.

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://botokaw.ru/strik?utm_term=how+to+use+big+green+egg+deep+dish+pizza+stone PDF link annotation
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/570369.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/chhNEid/59781917112.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/hfhegg7/fobiwozubajumoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/jhjco3r/veloj.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/ajST2kL/pinball_3d_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/sisalubitot/S70gfBW/cosmoprof_bologna_login.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/ahciggc/movie_trivia_shuffle.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/dgdZsib/dan_the_man_heroes_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/jeNhbgf/bewes.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/h7Xgjic/9180692499.pdfIn PDF document text
    • https://xizonadap.weebly.com/uploads/1/3/5/3/135326441/6247936.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/887BhjW/my_lips_are_swollen_and_itchy.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/idhbijc/electrical_panel_load_calculation_software.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/jiejfHu/nawipivuvesefesob.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/ieFXgg3/artillery_genius_3d_printer_price.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/zabevog/behavioural_activation_worksheet.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5432 bytes
SHA-256: eb8c6a155c87fe02e66c7c0a1b22dbfd2c219d1baefcc991c99d30ba8db90ff8
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 10900 bytes
SHA-256: 3c5153c996464a9340a36b150a6fd4d6e986e0e5b9e3f22205763677ef781ff4

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