Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd25ac33c75a220…

MALICIOUS

PDF

77.4 KB Created: 2021-02-16 21:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b02049e46edcbc66c663a715eb5c6dd4 SHA-1: 4de894afe9e5a487ed02e830d9d58098dc71a1fc SHA-256: 9bd25ac33c75a22083c645c8dfa1fcf3fba2acbe795aa2762f4c39ffd0a21043
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'esc manual', potentially part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=dys+blheli+20a+esc+manual PDF link annotation
    • https://cdn.sqhk.co/zurefaxenov/ijejc9P/nigepojufuwaribogofus.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/O8ghKDX/art_sculpture_garden_near_me.pdfIn PDF document text
    • https://xomilazarega.weebly.com/uploads/1/3/4/5/134511507/wexozidupimefuv-vododomelezukav-pabosano-vatuzukajuludoj.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/hfjijil/lalujugofifadofova.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/somodeso_zasak_nifevez.pdfIn PDF document text
    • https://lipixifafamuxa.weebly.com/uploads/1/3/0/9/130969384/jedapid.pdfIn PDF document text
    • http://nokirixako.iblogger.org/88316565111.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/puzawuvej-tiwosi-dafuliduwaxufot-doboma.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/e660736159c0.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://vutilunero.rf.gd/64049773786.pdfIn PDF document text
    • http://bopadobaxu.rf.gd/2016_fuel_economy_guide.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/78394313520.pdfIn PDF document text
    • http://gajovab.epizy.com/united_nations_demographic_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/todawitimes.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/giwasotedobujafuxuvatu.pdfIn PDF document text
    • http://dikubok.rf.gd/jilafiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/bcbs_of_mn_reconsideration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/brampton_manor_sixth_form_courses.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/harry_potter_theme_song_clarinet_sheet_music.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/make_your_own_letters_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 5148 bytes
SHA-256: d07fa216cb169e0662b33520203490377802b0dbf2f66ab24f2c06ab524b2b70
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 11160 bytes
SHA-256: 9725bd44778cec9a9baa4bd717b557e7efe1a48d7e6bc6b3dbd49cd2e22f9bc2
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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