Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1ad6bb0df6ce68…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 09:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 208653b8a4f4e196ad4d59793c5dde94 SHA-1: 58a0704daedaa88852bf518868e8a7fde34426b6 SHA-256: ab1ad6bb0df6ce68d234dbf1e8adb84b49d43c29cd32c986fbe434875427cb8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern as a link farm on disposable hosting, suggesting a scheme to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://rld-carbon.ru/file/nitelidizi.pdf In PDF document text
    • http://familiegravesen.dk/userfiles/file/dokanipukorogivezal.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/8010635281.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613986ba4df4d---72274384460.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/lobilawesapegubugojerimom.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906040440.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/rosijevasojuxopogudege.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/gesawutomozedomutemozuk.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/xadufawuzuxin.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/tevixifataluvisap.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/doweriguvuzugesogijojudul.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/nenekugerigenakibekuf.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/27641097639.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vamifanaraba.pdfIn PDF document text
    • http://tion.hu/upload/file/60945241432.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/bolajipesebukig.pdfIn PDF document text
    • http://cityfate.com/files/files/jenaxo.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/dusaxebiwonajuzexi.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/99605525206.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/begetenukevolixadijazeri.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131864ca140b---54353874849.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/48821512464.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/48783622439.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/rolavabujalawazelevisamug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+a+scrolling+platformer+on+scratchPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 18100 bytes
SHA-256: b9dc2ab12c4758d66475ebedb3bdc731c128eccbc789b5302b85a0ef515f9ac0
font_01_sfnt_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 15036 bytes
SHA-256: 42e020fc5451f59395b5255f908eb79e5fa06f26b99d95e3289df9b822beb0e7
font_02_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 11096 bytes
SHA-256: 0b649126ad743b5911ecd752bc3b12e38616ce84d8baf2bf22f99e63a4526ce4