Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dab185c6495104…

MALICIOUS

PDF

82.1 KB Created: 2021-02-20 11:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61fda8f7249395169cbe15f865f528b3 SHA-1: ab7f124b74fc0a1a0dac2f27f8167e003f98536e SHA-256: 63dab185c649510489c5f5bef6e87a7e305f0e52ade27a8b025948d40c2cf153
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation method rather than user-facing content.

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=what+causes+skinny+fat PDF link annotation
    • http://kijejakedaje.22web.org/tofomenelipidoditarer.pdfIn PDF document text
    • https://kuwoloxafi.weebly.com/uploads/1/3/0/8/130873903/xudup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5feea8d7c1bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_602535c6a6ffe.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/Jhehijf/91370848564.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/45310674965.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/c5TIFgc/pijilubunowobekumixa.pdfIn PDF document text
    • https://baduxobenef.weebly.com/uploads/1/3/0/7/130739850/dofijilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471704/normal_60065822929b3.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/desalipejox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_6006e6f483d34.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/kazekitexet-vitad-noret.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisowafoz.epizy.com/what_motherboard_does_a_dell_optiplex_780_have.pdfIn PDF document text
    • http://lakelasu.rf.gd/integers_worksheet_algebra_answer_key.pdfIn PDF document text
    • http://tunarijog.rf.gd/wiroji.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_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 5020 bytes
SHA-256: 23635c319d451f753df1cc87dae09eb35f5c3e7e88bae734d47c5124e2831e1f
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10940 bytes
SHA-256: 82c495f54acebeaab5fd8e607234fb9d8da20583b9d79d5b59882221a34a8364
font_02_sfnt_off000125ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EF 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04

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