Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13bc0b2c51fe2f8…

MALICIOUS

PDF

77.6 KB Created: 2021-02-14 03:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7384ba028a2510685678bc6089b0d976 SHA-1: 94c6c6ae4a9367e4a2567bcec6298ff01af60885 SHA-256: c13bc0b2c51fe2f80dae728a9b4a818faf773c8ff6d7af58ee55741bc8139cc1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, likely to redirect users to malicious sites. The primary malicious URL identified is https://jottigo.ru/wix?keyword=a+vision+of+shadows+book+1.

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://jottigo.ru/wix?keyword=a+vision+of+shadows+book+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366401/normal_6017472129739.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452852/normal_5ff40c764e50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_600ebecad9911.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/0gduONj/mouse_running_around_screen.pdfIn PDF document text
    • http://kojenobowi.iblogger.org/free_powerpoint_templates_with_food_themes.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/4dmIR6H/kleptocats_2_safe_codes_kitchen.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/iTP5hhA/league_of_legends_wild_rift_beta_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/ifdIpGB/pobugunonomanajixosorer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493221/normal_5fcff3e4effd6.pdfIn PDF document text
    • http://lagujegivupani.22web.org/hobby_worksheet_for_kindergarten.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366033/normal_5fe418767e27a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavonuloruzofeb.rf.gd/cartoon_farm_animals_vector_free.pdfIn PDF document text
    • http://tekudadi.rf.gd/bobilapomul.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/chahun_main_tujhe_hardam_ringtone.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_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 5264 bytes
SHA-256: 771490d6379793626224ddba5a5effc3ce6cc1fde5764edf88e24ec455b32187
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10556 bytes
SHA-256: ff16a0105983924158adaed8d37fcf5e22766b2affdb55e371987565ac434f7c

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