Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7070e7d1552ba4c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 16:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28563b75f396ff2c8eb62fde705ae4ec SHA-1: 1e8cd48487f37358413f1380595898908d0b7b6e SHA-256: b7070e7d1552ba4c88be7760c06732e7e61a04d616064d88cee68cc41eba5c77
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 or trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document's primary purpose is to host a large number of links to potentially harmful sites.

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 https://catamma.ru/uplcv?utm_term=kodi+for+android+tablet PDF link annotation
    • https://cornwallstaffagency.com/userfiles/file/mulusulujogaj.pdfIn PDF document text
    • http://uteambio.com/upload/files/42332090305.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/lezuxudozaxijadi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/zupivusigumed.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/95479735151.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/mivogiduritadakonone.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210914003507.pdfIn PDF document text
    • http://kechengchem.com/upload/files/juguvisolineke.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/81108744554.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/kitegagidijufolowikori.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/5717360797.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d11a15d6da19d0cded214dcc1dcc0c0e/bugoridi.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/negawekeziniradi.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219231448583884.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/warebozariwiv.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kazejosepaguvijopum.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/l2dd7c2spmaqqgpr6l7rmt2iu6/namodoxibazigi.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-13/20210913160101673553.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/76795128952.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43617517577.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/76655599571.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/67991306746.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/jobikorepufikiv.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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10312 bytes
SHA-256: d860274e987dd0cb9aa58104f85d6203a4eedd23ba6d6953a58d3d03e3183636
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 18300 bytes
SHA-256: c7aa48c967eb967ce97dfd960f5133222a573c09904d6b980a1006fd7ae61f42
font_02_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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