Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8e553c4e54131…

MALICIOUS

PDF

83.3 KB Created: 2021-03-09 12:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3e4a05f2de9c6e716b54c5b35a1b3f82 SHA-1: 251fade09830c767ddc26d78312a66e93f68e86c SHA-256: 7bf8e553c4e54131dc776d28920bde1b4098249b9209df15155c40c0f76528ae
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 phishing or trojan threat. It contains numerous links, including a prominent one to 'baarspo.ru', disguised as a search result for educational programs. The PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=data+science+masters+programs+near+me PDF link annotation
    • https://cdn.sqhk.co/zibepidok/xqjagdz/opera_tv_web_browser_for_android_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_603bf3953947a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_602c18f58ea60.pdfIn PDF document text
    • http://dressnbuy.com/headway_beginner_workbook_freedscvd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fcb36601be03.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/miePsDf/the_shadow_sun.pdfIn PDF document text
    • http://umkatrade.ru/xuwuvunamewopyh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_603a789a29d18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fdd13d6ebfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_600e955fde9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_60028e40ece74.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/iihihiG/at_t_stadium_attendance.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/fishing_guide_osrs_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/rinulazopun/q6hhGhc/59487218616.pdfIn PDF document text
    • http://fovazewo.iblogger.org/me_before_you_kindle_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_600e5c131b4e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewifavad.epizy.com/remiw.pdfIn PDF document text
    • http://wezojepodi.rf.gd/pusifafudopepuli.pdfIn PDF document text
    • http://biguvuxurezuto.epizy.com/crosswords_with_friends_answers_6_12_18.pdfIn PDF document text
    • http://wifapig.epizy.com/volume_of_cylinder_and_triangular_prism_worksheet.pdfIn PDF document text
    • http://lulikeleweworup.epizy.com/anatomy_book_file.pdfIn PDF document text
    • http://ketafek.epizy.com/lagu_modern_talking_atlantis_is_calling.pdfIn PDF document text
    • http://wedopuketid.rf.gd/biwuromubi.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_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 5220 bytes
SHA-256: 100317b3ad5d7df71ca216850cac8bbc84b2b421b8fb73dde7b1b365e58a43c3
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 11004 bytes
SHA-256: 1810824fb99d14cdfcd530d5063fe4e45a510a8ec82bf917fed2bed82a586f88

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