Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9186509a067887…

MALICIOUS

PDF

69.1 KB Created: 2021-09-12 06:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93b3a8ef9f0190720b4c29cd87ecb74e SHA-1: c650d6913cb27cd158bbe1a01a141317c291b448 SHA-256: 1d9186509a0678870ef151f0bde673cdd8ef8a2fd9aea999ce7d79517a4c5c4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The presence of external URIs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=android+yellow+triangle PDF link annotation
    • https://www.rougeindigo.com/ckfinder/userfiles/files/61027650960.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/68013636255.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/xekedajebofeke.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/xiwaz.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/34683754089.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/40279686592.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/6808966838.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80535651281.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/rijojo.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/jidosupa.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/nanadagokuwamesog.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/20669840902.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/linivomur.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/linikokivuter.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161352ecee9f42---dojitifozunogapozorobox.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/62434713472.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630599382.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/vewowimesukabugilugiforop.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/1311984941.pdfIn PDF document text
    • http://stonebreaker.at/vovipezokaso.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80476273763.pdfIn PDF document text
    • http://vitrine-prof.com/files/53767442962.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/kepubexuxojafobewuxogika.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/jaxinu.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/51610060894.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_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 14428 bytes
SHA-256: ec511709f4f7a80d1f8dafade056aa2b0fd07e878cdf2509abda9614e37e352d
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10436 bytes
SHA-256: 0fbef5d24c8dd202408afb57616e7609b6e6818eeeadeeaa10076fb193232047
font_02_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1