Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea3c9e90526a84c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 18:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0ec9a00ea30eee9136c45c1d2d053a9 SHA-1: 00623ad4e8e60d1ef88e5d9ea39aacaed80accb8 SHA-256: 4ea3c9e90526a84ca6254cd7287349635e2ee6e4a4aae9e24b6b6b23571105c0
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 trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=apk+de+pubg+lite PDF link annotation
    • http://vinhosnorte.com/images/files/80339520917.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130663f93eda---kojurigaruroba.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613311a720f5a---zenubu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zegirazekuvigub.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/91212541006.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/muramepavebal.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/jaxudizadunetidena.pdfIn PDF document text
    • http://dongphat.net/upload/files/22598763984.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wuxatosukuliselinulodax.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/99387091041.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/55607245703.pdfIn PDF document text
    • http://imoroz.by/upload/file/gadid.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jimawolugigujebav.pdfIn PDF document text
    • http://furniture83.com/upload/files/98693198519.pdfIn PDF document text
    • http://rnralpha.cz/res/file/94486507997.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/puxitenofitubotilebaw.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/gomatugejozi.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/80848051266.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/tabefunalunadaxewox.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68142912743.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/97107524567.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/40004235201.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/57502628385.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/doxivu.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/rasimopibaxuxukeniranigip.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_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 19460 bytes
SHA-256: aee925439677d7bb97fc7f1afdd7fabf32d2f82e8adfd31e58ac0000d48ca82e
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10224 bytes
SHA-256: 9aa50acb49315dbdc9b6bdb874c64b9d9b448df757aa9b5b8d8cb52be57c31be
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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