Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab23e1572c7bbeed…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 13:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2be4d069f5f09218891c277313db67dd SHA-1: 65e7612fb7a0d91cea94a7117774d646578181f3 SHA-256: ab23e1572c7bbeede01092cf596861d99fc479515afd8dbf5fc2ba6cfcce260f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, 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, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of many external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=android+device+not+found+mac PDF link annotation
    • http://kondicionery-noginsk.ru/upload_picture/file/jebigamajedo.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/vozimojekokagusizetowita.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/8437502925.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/digiwasof.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/49106707504.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/simedazexiximubedud.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/tesazezupijapi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905085838702.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139f832bc9f9---zezaxivetomatizafifatoj.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/57179209343.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/24357373101.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/88235063854.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bajejuxoz.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/geloradevov.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vojebojufuxunenu.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/xefokolabonoveg.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/73881452477.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/bopedixekiwe.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/12676704829.pdfIn PDF document text
    • http://labsshop.com/d/files/51935239772.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/25170365253.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39290054194.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/30447978d3702193de84002d01a8b995/piwizewuwakezawutesozigi.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/sasivoga.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/jokaborimozadako.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_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 10572 bytes
SHA-256: 75a33380062a9b5dfa4beb3ac0183103d1d3d39e5ee92c4175929b1ef1df9dad
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 17664 bytes
SHA-256: 4bd796604ffe19b3733ab05df3b204451840936c51b4e8c0b6ef944467c22c50
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1