Malicious PDF — malware analysis report

Static analysis result for SHA-256 441098bf89a3acaf…

MALICIOUS

PDF

78.0 KB Created: 2021-02-15 08:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0dff750052bc41e8454a6e1535fabf82 SHA-1: d0e4271c137c8df0b37ed5f0fc9103698dcf5704 SHA-256: 441098bf89a3acaf4af6f74f27bdda2c2c18b3506ddb0ed767da7b8c2681ea92
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=adding+3+numbers+vertically+worksheet PDF link annotation
    • http://beach-fruit.fun/zamaxudaxot2tv72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5feb47b4d540b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_602931b0559c2.pdfIn PDF document text
    • http://inostrana.com/receipt_template_for_rentalzr1xj.pdfIn PDF document text
    • http://mini-cam-v2.club/dengue_test_report_analysis9deg1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5fe0fd82097c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_600a631a3aef0.pdfIn PDF document text
    • http://naturebiolog.fun/jajojah7mm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fe61614bb245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_601ab144743a0.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/gdRfbjd/guguxejenovovebojaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366958/normal_5feb9dc50a9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe302c0394b5.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/0vjfhdl/talabinizofalegojojelupo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5fcd568ceb83a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_601716a9dde5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_6024b3ba41dcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fcf116e4f28b.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/Q1Jjduh/tiny_pixel_dungeon_guide.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://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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 5848 bytes
SHA-256: b348f8038d2a9da8989bd96c7aa3566b7bc62dcf4d55ee40213b998b8531a08b
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 10812 bytes
SHA-256: 78af944e6a3a7b66b0f9d6c506b3fdbdc43976aeb36686bd0ebc406ccc429014
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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