Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2825da48ac9b0e…

MALICIOUS

PDF

89.2 KB Created: 2021-02-28 13:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4aa78c18d5ed45bf9695f13536be942c SHA-1: 9b1c16c48a576b5017927b4bbbebd1d8fb9dac07 SHA-256: fd2825da48ac9b0ec7d1772816baec654d30decd0d88202d9a004801d6a17451
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing and link farming. The document body, though heavily obfuscated, suggests a lure related to 'law of contract pdf notes', likely to trick users into visiting the malicious URLs.

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://maypoin.ru/strik?utm_term=law+of+contract+pdf+notes PDF link annotation
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/forigegipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd0d40a21f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_601bcda49d20f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fda8350ad92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_601ba9be94770.pdfIn PDF document text
    • https://razitesewiwi.weebly.com/uploads/1/3/2/8/132815022/4217834.pdfIn PDF document text
    • http://vabodulesofife.22web.org/natekakopifuvasinof.pdfIn PDF document text
    • http://nemafivuduwidob.iblogger.org/how_to_put_ink_in_a_smith_corona_typewriter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobitemobo.epizy.com/aladdin_snes_game.pdfIn PDF document text
    • http://jesudojisa.rf.gd/83889564250.pdfIn PDF document text
    • http://suxaxisanu.rf.gd/argus_4_thermal_imaging_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/35455577398.pdfIn PDF document text
    • http://forubav.rf.gd/append_form_in_jquery.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_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 5152 bytes
SHA-256: db4c215950ea79fa8797c14f46b65513b0722a016397cdf2aebdc40ef6c87972
font_01_sfnt_off000130b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 11544 bytes
SHA-256: 77c1a4e951576340004f3c77bfb5eab9c516f1eb1850b3b38160662d1c79fcca

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