Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad0c4073cef4d7f…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 04:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2de6c50656dbe1dcf44f523d3bf9b043 SHA-1: e8c3233ebf1314c03ed7eb56145100501e301d45 SHA-256: 4ad0c4073cef4d7f4d5bf2940c30d75b47631973c2eb46f01e428c4ce25fd910
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'rockspace wifi extender review' and 'wkhtmltopdf', indicating a potential lure to disguise malicious links.

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 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://trafftec.ru/123?utm_term=rockspace+wifi+extender+review PDF link annotation
    • https://cdn.sqhk.co/mekekomubun/Objf7oY/bubble_bobble_classic_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_5fb626845a033.pdfIn PDF document text
    • https://site-1223179.mozfiles.com/files/1223179/14667283725.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/Yjiabhi/zombie_modern_warfare_4.pdfIn PDF document text
    • https://site-1171526.mozfiles.com/files/1171526/free_internet_download_manager_for_android_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_5ff36985832de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5feb6fe471508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fd3bcf874267.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/fingerless_mountain_bike_gloves_review.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/aDfhehg/angry_birds_pop_bubble_shooter.pdfIn PDF document text
    • https://site-1173293.mozfiles.com/files/1173293/lekegi.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/hhhUa2I/custom_bouncy_balls_bulk.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/fasanag/application_of_derivatives_problems_and_solutions.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 5408 bytes
SHA-256: f8dfeba2d6ec4aca39beb16969cfa8ced40bef912c88bea2b66c55d274a1677b
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10660 bytes
SHA-256: f62e6663b012ef840dabe94b17a09e98bc6242cc515da4591824b0ea72bd47af

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