Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ad1d4fec51baef…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 07:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d99b8969459a6890d0a69d27902004a SHA-1: af2aef961ed5cb4e74841e190076fa8761f0d385 SHA-256: b5ad1d4fec51baef0aea65ff708c4ced83cec7060a85a9aa0589a47ab3865ff5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.luthier-auxerre.fr/ckfinder/userfiles/files/7167256174.pdf In PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/fexopofuxugedokuwuzurel.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/toputeteso.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/zugixomosawowedaligap.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/setugud.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/70826671793.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/82590839133.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/divopirujokemu.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/6823911091.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abec7cc566---72645421265.pdfIn PDF document text
    • https://epiphanych.com/images/file/vapujexokumogusuneru.pdfIn PDF document text
    • http://industrialdevices.in/uploads/pujakezezososi.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210912_C5E137C642B99863.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210911203138010.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81509645015.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/38734302794.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/lagotuko.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/liwawowonetuw.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/80413726041.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e49c372038833e57f8445391fd7622ed/renejazezeromoxonuk.pdfIn PDF document text
    • https://angkalaris.com/contents/files/48279311940.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/96088230640.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/68374092801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=friends+watch+online+season+10PDF 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_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 10704 bytes
SHA-256: 6853c9dd277d57e763a455f6b685bd620cfa85d4daaea7d79f79c623ebdce142
font_01_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 16772 bytes
SHA-256: cd2904b5e443b7185ba38e5676b5eabaa86ae384cbfa52cd0a8ec7b74c8665d4
font_02_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.