Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aff8aa1a1d5b3c…

MALICIOUS

PDF

68.2 KB Created: 2021-03-03 22:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6110995f2f3740ac97a4d6eaa5e616a SHA-1: e37d52d0e8353feaa0d78e1b2f526a9843a70110 SHA-256: 25aff8aa1a1d5b3c06672f3f77ed03507e9dd18d857b8bed22211f6d3293781b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a domain associated with malicious activity. The document body, though heavily obfuscated, appears to reference a manual, suggesting a social engineering pretext to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=bonaire+durango+5900+manual
    • http://mesretly.xyz/rubiganusilijeiohny.pdf
    • https://venefenotufawu.weebly.com/uploads/1/3/0/7/130775800/8ddb252c36.pdf
    • http://matawobedopikam.mywebcommunity.org/13323021616.pdf
    • http://lnstagramverifiedbadge-media.com/galleria_borghese_guide0tsex.pdf
    • http://mevakimuvu.mypressonline.com/best_way_to_write_an_article.pdf
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/mulamitet.pdf
    • http://pasetbs.xyz/types_of_bonds_worksheet_section_28nh3x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fidalanono.myartsonline.com/dell_optiplex_9020_power_supply_replacement.pdf
    • https://s3.amazonaws.com/fajixe/pokadigezizig.pdf
    • https://s3.amazonaws.com/muwomapotumugi/excel_check_balance_template.pdf
    • http://pirafabitibabik.rf.gd/kamyab_jawan_program_application_form_online.pdf
    • http://litorow.myartsonline.com/18480175284.pdf
    • http://lafosowewamute.epizy.com/30504718371.pdf
    • http://fifabal.epizy.com/mubetip.pdf
    • https://s3.amazonaws.com/wixatax/zixanajedagorenemub.pdf
    • https://s3.amazonaws.com/wixamupelinere/christian_premarital_counseling_questionnaire.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_off0000ceb1.bin
fd56415c9b328b9a5b5d324447fbf7600cd0a386067074925093d4b4008bd0e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 5436 bytes
font_01_sfnt_off0000e119.bin
fbcfb03fba5b83901d29aeb521dee908eb4631e6e867a62a426b1cb3c274c721		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 10192 bytes

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