Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7b506c5999a92b…

MALICIOUS

PDF

104.5 KB Created: 2021-02-20 21:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5c238ed2f567ccc7bda05b0b158f55e5 SHA-1: d6d0f88831a2d2730390a909aa22e6bdcb3ef6d3 SHA-256: dd7b506c5999a92b32196b1814a59aacfb7e29c8017eb981502fdbddb24a9038
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, suggests a lure related to educational content like 'penn state equation calculator'. The presence of numerous external URLs, many hosted on disposable domains, strongly indicates a phishing or malware distribution attempt. The primary attack vector is likely spearphishing attachment, leading users to one of the many embedded malicious URLs.

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://jacksth.ru/123?utm_term=modified+penn+state+equation+2010+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501045/normal_5fe9e10701015.pdfIn PDF document text
    • http://prodson.fun/factoring_trinomials_with_two_variables_worksheetstggy8.pdfIn PDF document text
    • http://xubaseki.iblogger.org/22304230799.pdfIn PDF document text
    • http://batmbatm.ru/c._r._o_full_formu7go5.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/UFXPidU/download_game_ultimate_offroad_simulator_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/GCNhgZL/idle_slayer_ascension.pdfIn PDF document text
    • http://vomeperegobo.22web.org/53190565509.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/lcbb1jj/fuginusufuwatizazonomoku.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/jiijfjH/dymo_colorpop_label_maker_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fe06c88504f5.pdfIn PDF document text
    • http://copyrightsupporteds.com/raluwuk1zz5.pdfIn PDF document text
    • http://hook-up.fun/zosana22kib.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/metakibeme/tufowanaruzorofa.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_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 5608 bytes
SHA-256: be2778819b653b8a7edfed36640fe35d3188968746f187932d72bb231c865676
font_01_sfnt_off000155ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EF 12616 bytes
SHA-256: 75109c71c6b66a2f0f26bdd68e88fb945c3ddac867d7aa7d1b887dc5d17c2c51
font_02_sfnt_off00017fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC7 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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