Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe8b6d9090d7df8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 03:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4754a4376c381d1e0ae3f062ffce9330 SHA-1: f3d7de0ec4aac4e8af449f007b03517bec3807ff SHA-256: dfe8b6d9090d7df894ffbd12ceff8560dc294fc939f091d373c60248b50b200c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm designed to host multiple files, with numerous distinct hosts and links. The embedded URLs point to various PDF files, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://777mto.info/contents/files/42758699428.pdf In PDF document text
    • http://pm-ural.com/uploads/files/botuzugel.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/dugedus.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/41e9eacdfce9a2cbe664203ab4e0522d/gubifexazo.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210909033510.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/paxavazezudupiser.pdfIn PDF document text
    • https://activepymes.com/pub/file/laroxidusozezole.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/tirujowavab.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/80009394109.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/25162695267.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/janadonetabafuf.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xusibokigakube.pdfIn PDF document text
    • https://fond.ru/userfiles/file/24150248033.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/74182420486.pdfIn PDF document text
    • http://abnicum.com/files/file/kizopawupego.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/gukajomur.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/wuvoz.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/ruwuzeb.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/98749852305.pdfIn PDF document text
    • http://inphilong.com/upload/files/72549449797.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/02937c2dee7f3c36473893ea122bc607/23700379439.pdfIn PDF document text
    • http://chinalabware.net/d/files/zitaronolapamazibalu.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/78445110931.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/nudadumabazeluketanebe.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/losidutiguvejukod.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/dugodesovegowufok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=foxfm+file+manager+for+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_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 10508 bytes
SHA-256: c7d460f11b2fc3c08ef3bb9aab5fed541e50821eb3f180f127c0802897bcd050
font_02_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 18660 bytes
SHA-256: 8e687aa481b19f30e2d6dd99883c3d53aa8d5b87e6d1fce8572e7da0b2929397

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