Malicious PDF — malware analysis report

Static analysis result for SHA-256 5398d07d8e970230…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 11:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 427ed15c828883b5c1a33a48b8d17bee SHA-1: 7944e46dfc10e688188a03aee09bc4178777a395 SHA-256: 5398d07d8e9702309ef9ce5a73c6084e1724b26e2e93ed96bc9cf86c49fbb6bd
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary external URI pointing to 'dugedepap.ru', suggesting a phishing or redirection scheme. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

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://dugedepap.ru/wix?keyword=stany+zjednoczone+polski
    • http://afracheat1.xyz/the_great_i_am_lyrics_james_fortunerq3pn.pdf
    • http://marketeuro.pro/16611269689c3ne6.pdf
    • http://plafond.xyz/71428027334axvqn.pdf
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/tuwozelebuvodonop.pdf
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/tomuzumavakerotu.pdf
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/7918431.pdf
    • http://usejus.pro/703536779464bkch.pdf
    • http://baliferifopiz.mypressonline.com/what_is_wizards_first_rule.pdf
    • http://eurofamily.pro/painting_ideas_for_8_year_oldsr8e1l.pdf
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/pupupetek_janabemoves_nalanonovarasip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tevigotu/xawuxorubolupak.pdf
    • http://jalijoruki.atwebpages.com/timijunofixetilakewu.pdf
    • https://s3.amazonaws.com/zarusegibitumet/99068722490.pdf
    • https://uploads.strikinglycdn.com/files/cdd6d339-4860-4abb-81ac-eb2da6819619/international_journal_of_applied_business_and_economic_research_impact_factor.pdf
    • http://bebovufuvuji.myartsonline.com/free_printable_math_worksheets_for_1st_grade.pdf
    • https://uploads.strikinglycdn.com/files/00f16193-0069-406e-8f09-77671b494dbf/weramevezalomovuwikej.pdf
    • http://xawiwevivuzox.onlinewebshop.net/fake_medical_report.pdf
    • https://s3.amazonaws.com/satuja/bounce_tales_adventure_mod_apk_unlimited_money.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a8.bin
f09b8e44c88e5831a26bcea8acd7f60e5a1e3aca4e2c3aa3beb3d2c0a0804f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 5368 bytes
font_01_sfnt_off00010416.bin
d668be01a0a4386e53298720dfc0d601d588cdcddd4f0560e689fc71e6471f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 12168 bytes

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