Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0ce77513b10f14…

MALICIOUS

PDF

74.5 KB Created: 2021-02-10 21:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c24bb4472f2cf4f7508e2128e54bd12f SHA-1: 2fca09b2bc0d49ab7fdd69fcb853166665211c87 SHA-256: cc0ce77513b10f14c9617d7cf93b5f4c28511fdd4975dfc663b1ff0b0d4446d7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic indicate the primary goal is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/aws?utm_term=pathophysiology+of+valvular+heart+disease+pdf PDF link annotation
    • https://cdn.sqhk.co/pozedezupase/iCrhaq8/laxubibegiwuvu.pdfIn PDF document text
    • http://makikupake.iblogger.org/role_of_auxin_in_plants.pdfIn PDF document text
    • https://wegizazuxiri.weebly.com/uploads/1/3/0/8/130814830/piwazajejabomul.pdfIn PDF document text
    • http://mavito.online/simplenote_app_for_windowscxdm8.pdfIn PDF document text
    • https://cdn.sqhk.co/gejemizus/ghbXOhg/football_strike_multiplayer_soccer_game_download.pdfIn PDF document text
    • http://techanomic.com/class_12_biology_book_in_bengali6sw0s.pdfIn PDF document text
    • http://pugalibapuf.iblogger.org/nukuvinujafofanugezisine.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/5171552.pdfIn PDF document text
    • http://manaluw.iblogger.org/tuziwuxuto.pdfIn PDF document text
    • https://cdn.sqhk.co/tawumemikuva/gAKjjij/gubovinazetupoxozodufojir.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/bAheih7/55120777378.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/HggijWA/electricity_bill_check.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/tudawufed/antibiotic_spectrum.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/diana_lol_guide_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/erie_canal_map_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/43031804797.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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 5464 bytes
SHA-256: ffb6bdfc34cdc154f59938b03068d0877a99202a9ffa5464dc46ef242410914f
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10748 bytes
SHA-256: 69e192257e699b75bb7ce6ac4f5bd6fcd71e4ae66055423b03d39afa55ea2a00

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