Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3027f78d6cd0889…

MALICIOUS

PDF

69.4 KB Created: 2021-03-18 23:14:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6ab2f28b8bfa6d00fec9f50d4eba3864 SHA-1: 00f368e1a478c05f3b2990f1503b20e949703e94 SHA-256: c3027f78d6cd0889b88875051f4df24670daa95cd2dd922dd8a562d50374b08c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to known malicious redirector infrastructure, specifically targeting a keyword related to a calculus textbook. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to a malicious site, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=calculus+and+analytic+geometry+thomas+finney+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5ff553a08672f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6037bb1ebeb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_604cc6f0cf0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600c8dad3e623.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/gj95jgj/japanese_prime_minister_hideki_tojo_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5fe3845018ab0.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/lokonodedazininamaba.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/buzedinuzorasetesizotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5fd0f00046fca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5ff7f39327788.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/dream_interpretation_dead_baby_floating_in_water.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/DpgekKO/penguin_diner_3d_unlimited_crystals.pdfIn PDF document text
    • https://cdn.sqhk.co/rivojotewez/dFTgeFD/69657628850.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/vugevilozetivepezifiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_e0eef48dfc124480869bcd79507652f3.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_2c768f9322e74f54ad5cb28dfdd77c36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/57755747326.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/13505103430.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/ravenufubajinozenu.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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5576 bytes
SHA-256: 238f412cfc3a2b90ff5e1e0c1917ba29d8238878872da22e157edd6eb8181534
font_01_sfnt_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 11080 bytes
SHA-256: 93bec083de620d8f71b9c97d4aec1dc574c4f12ff85cdb3303c3830a54d9b14a

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