Malicious PDF — malware analysis report

Static analysis result for SHA-256 f290fbc95179d82d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 13:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11d9deb78c57c5872749a35e9a9b3c20 SHA-1: 16e7cbaf0fd67e4086b06b968a8e07e39196c346 SHA-256: f290fbc95179d82d1d1a9cebaa930cc2e48973f45a3064f85c2e55a46b73b2b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to redirect users to these external sites.

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://adikmanis.com/contents/files/38624150999.pdf In PDF document text
    • https://martan.es/cenavarra_userfiles/files/jabus.pdfIn PDF document text
    • http://leton.pl/userfiles/file/65777345321.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8ep39hq0mcr697panafo8huclr/86400868563.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143e82f10a82---lonedafefifiremu.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/dipewowabo.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kuxuwevofotorak.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/xeximip.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/wepeju.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/pizazoratijasiwixokonize.pdfIn PDF document text
    • https://limsurdua.com/contents/files/76590730617.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/34740569343.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/64800659016.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/20767271171.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/worapefubakewuzovigadit.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/30558178237.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/xefasasadenulolumokutawur.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/kurizudu.pdfIn PDF document text
    • https://fishboat.hr/files/83233994530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+email+app+for+multiple+accounts+androidPDF link annotation
    • 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_off0000ae6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 10936 bytes
SHA-256: 086b1b3ca4c958fbb299dfa45201bfe48dbab1ec95c1bb66290cb1774c6d4043
font_01_sfnt_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 17844 bytes
SHA-256: 66f345684021b328788bbd5681cb259fbabf3b7ff0f80595c4ed5dc28b82fecc

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