Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cff9e23a342923…

MALICIOUS

PDF

77.7 KB Created: 2021-02-21 23:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ed7bb1371d664f5da6aee8ab928c9d79 SHA-1: 842c469e4118f0a44aaefd39b70073eb9008021e SHA-256: 93cff9e23a3429230879b193f6c775770d2e5e945f48a3e0f8ee00f715e5e261
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('leonvi.ru') that is part of a link farm, suggesting an attempt to redirect users to potentially harmful content. The document body is heavily obfuscated and contains metadata related to 'wkhtmltopdf', indicating it was likely generated programmatically rather than being a legitimate document.

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/strik?utm_term=white+christmas+song+original PDF link annotation
    • https://lipanoragufa.weebly.com/uploads/1/3/4/4/134489679/a3596ee4d.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/kupaw.pdfIn PDF document text
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/8ac724aa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rerorupi.rf.gd/how_to_use_electric_aroma_oil_diffuser.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/bipojirexudekikuxanizubu.pdfIn PDF document text
    • http://gevosumol.epizy.com/2073502333.pdfIn PDF document text
    • http://wasuragexoledar.epizy.com/punctuation_rules_for_beginners.pdfIn PDF document text
    • http://xenegivijofawok.rf.gd/6439641934.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/bass_guitar_pickups_guide.pdfIn PDF document text
    • http://xatudoxi.epizy.com/philips_avent_monitor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/what_is_the_starting_salary_for_an_international_business_major.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 5228 bytes
SHA-256: 6575bad6ad61b5e863552e4f4b651f52cf9d88717c9308e995c816c6b8b5ff43
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10352 bytes
SHA-256: 27ea64723f3d7fd8c47c7ffaddaff4ccc6b861f33c67dccdc141083365ccc2a3
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

Open this report in the interactive analyzer, or submit your own file for analysis.