Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ccd5a27bb55504…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 16:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 287b39853bf9c76fc6b59c9d49bad49c SHA-1: c56d89950a86a9d53beb5e8b1e451485d3f861ca SHA-256: b1ccd5a27bb55504ed6c0ffaf84b3482f616800e23877156be8b1a3fae75a57d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://smidgel.ru/uplcv?utm_term=how+to+draw+a+ring PDF link annotation
    • http://litroshaber.net/resimler/files/bizapowinasaz.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/86975993002.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/49530f525044c8d1912cae63a44e43ac/22988754199.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/laduxivod.pdfIn PDF document text
    • https://blv.by/upload/editor/files/devivawunavuzi.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/21448246688.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nezofanafefowomod.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/josimo.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/88291931031.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/mafumisudiwawo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///84961373266.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/zibawiraniris.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/ladenisofulesokumuxa.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/perizowabubuxafa.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/kejimisejasugawulaz.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/84212434924.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/4617917049.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/niwifibiwedujofazunum.pdfIn PDF document text
    • http://notarius.jurist-info.ru/uploads/news/fckeditor/file/48072018680.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101031074217.pdfIn PDF document text
    • http://strandedtattoo.com/file/pezevizim.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2998c14e328c4ed4c0fab65b586e76a4/89724047908.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/32669169279.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/nabaxefura.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/96584275367.pdfIn PDF document text
    • https://pratham.one/file/19870607237.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/47800516550.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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10156 bytes
SHA-256: 571bd389e1f1388ff551cad5fc97564e2d72902d859b04f33a6b7f25a7cc85ab
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 17200 bytes
SHA-256: 9b5c7af3894625cfe45b7d69f40c46bbbdd000c377ffecd71c9b2bf469be6cba