Malicious PDF — malware analysis report

Static analysis result for SHA-256 185c152515d60bfe…

MALICIOUS

PDF

96.8 KB Created: 2021-09-17 07:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff59a5c9da6daeb2e6cb15a8ddbc80d5 SHA-1: 8d378c4c7ded42e4b131d67a4d96973d74ece63e SHA-256: 185c152515d60bfe9a5bbf49b2a4b11dd6f0ae09230ff2da8d82a3c4ccfb6361
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=microsystem+and+mesosystem PDF link annotation
    • https://amzentransportationindustries.com/admin/imagetemp1/file/saduwimizitaxamexezageke.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/pigagixojejokusel.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/rogezuxusumot.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wiwoj.pdfIn PDF document text
    • http://nfc.soo.jp/file/47585485859.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/kapedobunudujota.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/jederefisi.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/83269060940.pdfIn PDF document text
    • http://wdnederland.nl/file/relevubomizepexurirur.pdfIn PDF document text
    • http://abwva.com/uploads/files/wonakobikesovufo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/61d171c21cda9d426b42366351a38c20/misemi.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86389039177.pdfIn PDF document text
    • http://net-marketing.hu/images/files/47031324016.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/fepugizavotojalagebapewet.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/23831690676.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/64973730688.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/majerox.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/24100129997.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed2a089d1---97230339635.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/63587055399.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/79815438189.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gujejamumujeregejazub.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zulenigezevejuwan.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/41386975490.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/bajepolikurezaxepoxanim.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_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 10592 bytes
SHA-256: cee9a57ac92d9363c34aef20c675ea2ee73aafaed9d891b2c82ece76679dc355
font_02_sfnt_off000144ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EE 18716 bytes
SHA-256: a1f9469bd59f65b75b226d9912c112b8f052cb1fe96e9c81515b2a2625596d5b

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