Malicious PDF — malware analysis report

Static analysis result for SHA-256 238db529706ad399…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 01:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7db70586a1666114275e9b46a94757e SHA-1: ac1e29f2f3583d23fcbfdcf3fef23be7602d5919 SHA-256: 238db529706ad3991bf65ab0f371fe20289a34db5905b15b13bb631a285bfd5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://bagliodeimille.it/userfiles/files/forojok.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161345eada6c83---59740653125.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/25569302920.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/10537108260.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/ruvupirelugozosewovepasej.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/kekekupibosuduvibide.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/fovowunibapodulemuxi.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lujidosinazavovekinavid.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/28711361052.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zosedapimixarilili.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/jajavarujixelu.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/fedonajuradopelemidubofo.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/45732826653.pdfIn PDF document text
    • http://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/vedebederokowemowoludare.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/pasiz.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/roroxilesetopobubi.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/dodawawevisasopimeli.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/83212711143.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/70351460255.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/garilojogepimiro.pdfIn PDF document text
    • http://mega.kz/media/upload/files/kekateximujek.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s0vjumnq9aupn2h39ooqgplu8f/noxakimewurawiku.pdfIn PDF document text
    • http://infoguard.ru/content/file/janotevowapolumidid.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/80664543628.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210912003756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dress+up+time+princess+apk+modPDF link annotation
    • 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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 10820 bytes
SHA-256: 8bb521eab441dd18da3a595b608a73dfda328948830d91ad3ab84cb3dbb6a1e1
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 20016 bytes
SHA-256: 6120756d015d7249abc2c6da1b477350437637033bf5f998f19e9a2d345aafbb
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1