Malicious PDF — malware analysis report

Static analysis result for SHA-256 688b3b7a75367f86…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 05:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fb3f3f03a63c0bcb97e208cc4e4a53a SHA-1: ef4eef671d654e01e7ea65f7924e1e0f5fdfedca SHA-256: 688b3b7a75367f865396b6b76917523c75c253057b27c24817709a55b630d81d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=old+version+of+snaptube PDF link annotation
    • http://klenderbio.com/upload/files/wezadatejabakiz.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/76940781378.pdfIn PDF document text
    • http://toroisg.com/public/images/files/75968089634.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/10916300803.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/matipap.pdfIn PDF document text
    • http://cbstav.cz/file/wijekipusuroje.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/31608653720.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30594484696.pdfIn PDF document text
    • http://consade.com/userfiles/file/vixojanevili.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93520effb692d1eff07a8597c54ca4c3/98593938382.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/kezikuparujogivewusun.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/76709448976.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/1613927152.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/47639060371.pdfIn PDF document text
    • http://sakem.org/userfiles/files/papebutew.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/zetonalotupuwerotab.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/55813969644.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/34227681428.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/26138804519.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/misepixodiwusij.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/riposisasom.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/lixakanuliv.pdfIn PDF document text
    • http://grossbuch.com/upload/file/60591331718.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rafifejilebirukilowiri.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/33412606487.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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 10824 bytes
SHA-256: 6ad76c55e66a0aaf287946f95d5d7d1b874d5db93295130b4c94b3b41e4a459e
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 18964 bytes
SHA-256: 1e865fc99606360df4ac110d7122612a6a92768231f57afec2a70166aa2231f8

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