Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86c0122c3d75c5f…

MALICIOUS

PDF

70.8 KB Created: 2021-02-15 08:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82fc6de36081aaf0796602af727f4bba SHA-1: c8d28ce179325c0f5a1c047b64bd12d8f28fefaf SHA-256: c86c0122c3d75c5fdd3218eefd8b51bc43028414dd06bd379150c75440cff38e
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to potentially malicious domains, disguised as search results for educational content. Heuristics indicate it's a link farm on disposable hosting, and a machine learning model flagged it as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=holt+algebra+1+chapter+9+test+answers PDF link annotation
    • http://sowurokirifi.22web.org/lojokozijokanunifabe.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/igDrjjS/zig_zag_baby_ballroom.pdfIn PDF document text
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/8247206.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/geT3q11/human_fall_flat_christmas_level_switch.pdfIn PDF document text
    • http://vulekemuluka.22web.org/3d_brick_breaker_revolution_android.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/xirixepo/government_white_paper_template.pdfIn PDF document text
    • http://temefolix.epizy.com/simple_home_page_html_template.pdfIn PDF document text
    • http://jufebiwewizeza.rf.gd/11767661454.pdfIn PDF document text
    • http://ladipuxot.rf.gd/58665251780.pdfIn PDF document text
    • http://worined.epizy.com/baal_veer_2_ka_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/remufogewufolin.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 5596 bytes
SHA-256: 7e5f18870d1cf898c153769df5f9ed361d418d362dabfdaca5dd876a2a575a91
font_01_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 10672 bytes
SHA-256: 38897d6c6463d329f6188c0189f91bf0ce18229212f6a70cd18c381622b47cdb
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16240 bytes
SHA-256: 840aca7af89d6665d446bd68a022ef871a8c4a07170005e3094ac854b8115bb7

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