Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fae7efb8f179eba…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 06:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ef04c2f5e4c5de8a9d1b87c3ec39922 SHA-1: 757a1ed716dc8a490cfc5251af57ffc7abf791fd SHA-256: 7fae7efb8f179eba410445e1e958ddbb000162612805be97497c069f1061f31a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=descendants+2+watch+online PDF link annotation
    • http://1-cities.com/blog_images/blog_/file/29813010528.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/77585796272.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/98367185682.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/wipanepezarogagusupigegib.pdfIn PDF document text
    • https://theurbanthinktank.com/files/jiriwux.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/wafosajoresadugi.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/7503662322.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/18040424395.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/sejage.pdfIn PDF document text
    • https://iohrp.org/f_files/files/60099721999.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/gajafexamobonujazabiruzit.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jolutuwelokeze.pdfIn PDF document text
    • https://lapakunited.com/contents/files/20412633226.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141199c2db51---nupopogipefit.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/23851733652.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/62090268397.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4bcd340e0d3d3b6e586134d8889ebe8a/soraruxuwelapibip.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/raposusilekajawozafadene.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/72465363828.pdfIn PDF document text
    • http://gojjang.com/uploads/files/guregu.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/59528526716.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/pakawuxutikokikavuvok.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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 10576 bytes
SHA-256: e80b45ee707f61187272a0f254b4c1d9280092817c5d3c2c69f20e1aa3cc2ed4
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 17844 bytes
SHA-256: 42acf65d8cfab9133a8725430511233689f00109f913ec5a45ccb2e4488e3f3b

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