Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b117bee98b3278…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 15:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 285fa6678cfb9fe359fe3177accfe6e1 SHA-1: 061a4f11dafd25e899e13b5e2908e28007937d15 SHA-256: e2b117bee98b32781dd61e8f203df2e91bfaa087762c96b2cc7bf63e27ad1c84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to potentially disposable hosting, suggesting a link farm used for redirection. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to lead users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=android+studio+development+essentials+pdf PDF link annotation
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/labupumerufebidazodip.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/41320119227.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/fumokediviwebo.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/funadopiwawu.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/89372971476.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/tunuwugutedavidokeju.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/pumel.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/rixumimelutodumovezuduru.pdfIn PDF document text
    • http://mp-journal.com/media/file/81331727957.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/tojupavizugodadesakeb.pdfIn PDF document text
    • http://renknh.com/ckupload/files/lexixejotosad.pdfIn PDF document text
    • http://hzqzg.com/d/files/wajolixora.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/55234780078.pdfIn PDF document text
    • http://itena.si/uporabnik/file/wokabofozisukubar.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/37591356391.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/mewopororapuluw.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/15746926683.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/45306775103.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/lanexafareveruvewedar.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/7648726824.pdfIn PDF document text
    • http://baoveantam.org/upload/files/kojabigagez.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10808 bytes
SHA-256: 01727cb2819e320fa7216cbb2c901b3ecf481eb5d7f0fefee8114bcbc487b53c
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 18576 bytes
SHA-256: 77a78266acfee0f3c580b7be047b43c9e46275621a2dc130a195adbff16a9fdb
font_02_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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