Malicious PDF — malware analysis report

Static analysis result for SHA-256 373c355a1374d851…

MALICIOUS

PDF

77.9 KB Created: 2021-02-14 01:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3c0f3ab6b953e75e9a71353f78075cd3 SHA-1: 21eb16b8a00bb1150c88e693d9da8d632726fab2 SHA-256: 373c355a1374d851cd0f963c7f2a9de4bd0cfd4e9e02dc936de8b090153877f5
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to a book title, which is a common tactic for disguising malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection to external sites.

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://leonvi.ru/123?utm_term=surely+you%2527re+joking+mr.+feynman+adventures+of+a+curious+character+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fd37668cb855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ff6c6f9df02d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_6026036cd31a1.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/GhhfsdB/nuxeleruzimafawowufeladax.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/chePiih/81320494417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_6009f10f381d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fdf5c73a3349.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/hrhaha8/nopijojuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5fc6c12f3868e.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/QhoiaCU/prop_hunt_code_fortnite_farm.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/0cmJjje/jungle_heat_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_5fcb1a5ed8baf.pdfIn PDF document text
    • http://puxuwowu.iblogger.org/gativux.pdfIn PDF document text
    • http://leduxebawini.22web.org/common_core_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381997/normal_6000ab35686e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_602533cd81b72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nedugone.epizy.com/solo_jennie_clarinet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/cognitive_development_worksheets_for_preschoolers.pdfIn PDF document text
    • http://midotujeg.rf.gd/nudopilazujakaripibow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 5924 bytes
SHA-256: 856924b5f02cfb3b915d4da2c7b367d203fefecdbabf3fe24109414ce6d6facb
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 14004 bytes
SHA-256: 8e5d40067d433f148f036f7f707f89aa0c5b426a3329586fbbb82e48db720612
font_02_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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