Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb33d71b2d7e5100…

MALICIOUS

PDF

74.3 KB Created: 2021-03-04 12:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5a47a7e455b7733cf4b826d0b443561d SHA-1: 8337d56620360754c8fbb61fe5f1d6d9c8968a04 SHA-256: eb33d71b2d7e510042dcad942da1217b839a2b915b75e9c14c0c9aaf25c135cd
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, including one pointing to 'pelibifir.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to RAM compatibility, aiming to trick users into visiting the malicious links.

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://pelibifir.ru/strik?utm_term=p8z77-v+lk+ram+compatibility PDF link annotation
    • http://item-get.top/12033205330eh8l7.pdfIn PDF document text
    • http://urott-hu.com/life_fitness_95_ti_treadmill_manualdtvf3.pdfIn PDF document text
    • http://subbellassecret.com/whale_talk_chapter_10_summaryyaen4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fcc4f05aba5e.pdfIn PDF document text
    • http://beach-fruit.fun/best_android_radio_app_ukc2u8o.pdfIn PDF document text
    • http://lozhobelir.space/bus_simulator_free_download_for_windows_7bcake.pdfIn PDF document text
    • http://creamwalls.space/731075967771llac.pdfIn PDF document text
    • http://kamini33.ru/c_mvc_interview_questions_for_2_years_experience6blf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_6032aa2bf2766.pdfIn PDF document text
    • http://sayseedokg.com/mojadagagoziworixadikomexldey2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejowuwa.rf.gd/45391076212.pdfIn PDF document text
    • http://relumewamamit.rf.gd/kendo_ui_spreadsheet_events.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/bugujejivose.pdfIn PDF document text
    • http://wifapejaxim.rf.gd/tujomomesamutawo.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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 5624 bytes
SHA-256: 7de8a6de4f815b0056f993d260dcd324c83a79e64c56bd106bfebcfda8a731bb
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 10744 bytes
SHA-256: 16e7078d367f8b5c7d7dbd208071e247bf2c21f54e4413af46189c1a7d048ae5

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