Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac5526f29999828…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f9d90a6bdf87b94226296ba8f27702 SHA-1: fe3248094ecb4f2bcf4739c85c2f5aa9491edac2 SHA-256: 7ac5526f2999982818e4b17043914918069dda906d7f1fb463398d136199b36f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains and appear to be part of a scheme to distribute further malware or engage in phishing. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--krmer-dnnebacke-1kb72b.de/files/file/60101375577.pdf In PDF document text
    • https://angkagenap.com/contents/files/vavidozozi.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/wekujesejozugopabub.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/61625564700.pdfIn PDF document text
    • https://moolans.com/uploads/files/89341511823.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/dasipobokufopuvujuxevifoz.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/vajawikafulu.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/zizonavuxubelur.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sepodopomaroser.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/85229699011.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wejogivixexa.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/40642100623.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/dosulokoxolaxevefovowobig.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/27539096998.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/gegese.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd28ac4ee---nibaxegajituviw.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/87912701223.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/96095514955.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/lowewobefimi.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/52391805636.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/xuzuxurojeti.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/xonegutefedaboxux.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/ketamapituxiladefimujajus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+tekken+3+in+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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 17868 bytes
SHA-256: b89ae348b43e781ae47059745bbfe88d67863c10475012d32cdc9b89e37c9fce
font_01_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001273a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 10424 bytes
SHA-256: fc6465e36bdfe66e66f1db99be20dff1460d03b6294d153301f234f9e423bd49