Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f51dfb8f639c83…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 06:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5716f9b0215c0da7bc6323b87d649b7 SHA-1: 0ee29f103d35de10e12055cfd3e3c97e30388a72 SHA-256: e7f51dfb8f639c830d1e69242b289b0d9abbbbf89ac83eac0ac9a27ef4268743
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The embedded URLs point to various external sites, reinforcing the link farm and potential redirection strategy. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=nothing+is+downloading+on+play+store PDF link annotation
    • https://abbma.in/admin/uploads/file/51476884628.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/68704646392.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090610582770554.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/nufutedanetapufifebulefil.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/45574388403.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/rusuvuxewesil.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fef369c01cef9c380d82ce671c1da55f/buxibuwipofu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021916822385713.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__614226700A969.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/55388679565.pdfIn PDF document text
    • http://rjt1.org/upload/files/laxonasikilulumuboti.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/54399548507.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/15386318659.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109111355533734.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/80728508126.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/78989725610.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/88314492815.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/4851590201.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/11213630623.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vewisivijijise.pdfIn PDF document text
    • http://deforma.it/userfiles/files/1607727528.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/68339573701.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/xupegaziriwugerinaritaf.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://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_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10848 bytes
SHA-256: 78883c6475483a1f283ae6a19c4c0baedc7cacf1fc4d9ffb40eeebee0fd57335
font_02_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 16488 bytes
SHA-256: 3425dc2cb59e2ac800292f01f48cd062923013157d90e3d8a27b02428f3ba645