Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4093ea0cfbb671c…

MALICIOUS

PDF

101.2 KB Created: 2021-02-18 16:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c8b5e957254ed980c64385e0cd8e408 SHA-1: 4b3a271e7ea6824cab4955bf7da53c361e0fd69c SHA-256: b4093ea0cfbb671cc96ab44a3c2ebab5be1fdea8b0164afa3d1dcd5f84f71b45
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. This technique is commonly used to redirect users to malicious websites for phishing or to host further stages of an attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=what+do+u+mean+by+indirect+development PDF link annotation
    • https://cdn.sqhk.co/jalafimimodo/EhgjgeZ/v_moda_crossfade_3.pdfIn PDF document text
    • http://circleshtang.xyz/burumurozugakexop5ga0w.pdfIn PDF document text
    • http://rineset.xyz/beneruzotoxnp7k7.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/0iheQgc/xipatatixifuminavominu.pdfIn PDF document text
    • http://rezotu.xyz/13815388528uhujx.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/gihjujd/ranilobugedit.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/gjEQVjf/bingo_dreamz_free_online_bingo_slots_games.pdfIn PDF document text
    • http://apple-fruit.space/nigejorisubatublzy2.pdfIn PDF document text
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/4763314.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/v41heHA/2020680625.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/drjfjiR/whamic_keyboard_voice_to_text_converter_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/BjaaiiO/roblox_scp_site_19_script.pdfIn PDF document text
    • http://eu-study.ru/adhesive_bonding_processzvc8r.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/thie7AY/nova_launcher_android_10_download.pdfIn PDF document text
    • http://bigno.space/d_day_1944_game_download7s796.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/0khbx0k/ps_remote_play_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 5448 bytes
SHA-256: 8e89044ebb091e020200c98cb18d37410c7336029848d1ace7b953057acca163
font_01_sfnt_off00014d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1F 11084 bytes
SHA-256: 6ebccc664ee7a27b977d9e16b81e8f9dee4913023e521d5d2089102890b272b0
font_02_sfnt_off00017202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17202 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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