Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bb036f5353a200…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 12:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57dfc23c0edd44e712517b21fcb4b7b1 SHA-1: 401d406a533a71f108eb845ff8da6c0f224a515e SHA-256: 35bb036f5353a200b9f4ac9a9df9b4dbcf2071ec81e1b55564689b8dca781808
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=apps+like+procreate+for+android PDF link annotation
    • https://galerieportelouise.be/userfiles/files/rizujizeletumi.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/zupenabetiseresipen.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/tagobigedinosizulupupiti.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/sotidiso.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/gezezataxikixeneke.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/donagi.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/43813345284.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/18884820679.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/08c09ee6f21d674fadca681f30f49978/99891577889.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/lugaweperuxoteb.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/55966116393.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zevasezozugopisosowa.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100849209036.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/jobevi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/822753638f57f74769153a52676b3444/wisekezewewakevujaz.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/91149602524.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/67239136915.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///58487414215.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/lidobozikaligu.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/18635654680.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rafifatosejer.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/paxupusezivap.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/61164482396.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/52549274101.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_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 10684 bytes
SHA-256: 8eb4cb6a5fda6410fa1c5c32b86447d747559b726fcecd745d853e11a3efe987
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 18200 bytes
SHA-256: a56214881defd357c513049d1600ec6c4c0ea7e24230b5aaa370e1b4d183081c
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1