Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c07c71bffad997c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 03:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf0414e4b41fed1a6a1212952fbc66df SHA-1: 3af112f207325965931f9671e020f0110c14b048 SHA-256: 5c07c71bffad997c64ace06a47e3c2241ca4cca69f713175ee05eec142aa0812
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, including being image-only with action triggers and a small file size, typical for a screenshot-based attack. Numerous unknown URLs were extracted, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://faisaltowel.com/survey/userfiles/files/63383564209.pdf
    • https://rentcar888.com/uploads/files/202109260702131856.pdf
    • https://worldtradezone.com/userfiles/file/21062098810.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/tumefekodilobifi.pdf
    • http://asude.istanbul/ck_images/files/89504180324.pdf
    • http://caopump.com/admin/userfiles/file/budemumin.pdf
    • https://nhatthiengroup.com/files/uploaded/files/rujunodewuvuseri.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/70700091175.pdf
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/59398375528.pdf
    • http://fkhd.cz/data/img/67006640277.pdf
    • https://bruceleevideos.org/images/file/49946950383.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff90f866a4---webixiberepopotagolus.pdf
    • http://jubileejec.com/userfiles/files/nukisabitigawumoz.pdf
    • http://bularz-auto.pl/images/userfiles/file/nubibogotup.pdf
    • https://brihat-group.com/assets/userfiles/files/genojemobitemutejafup.pdf
    • http://havefuntogether.com/image/upload/File/10977226575.pdf
    • https://unibel.pl/pliki/upload/file/41240477199.pdf
    • http://telegid.tv/userfiles/file/23272922776.pdf
    • http://tinhdauvietnam.vn/upload/files/86081814866.pdf
    • http://tryinvest.eu/userfiles/files/gigebosilipusimel.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7bccca0f0---morawosivokusovojalus.pdf
    • http://sushiloverca.com/uploads/files/31684473644.pdf
    • http://jgbt.us/pds/userfiles/files/63081630795.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210925040014.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ranks+in+the+soviet+army
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b17f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 16792 bytes
font_01_sfnt_off0000c991.bin
37a6157a0c1f399db2d425bb4a2ae581dfd7bc7d5ac8bf8e35c4173495250f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 13952 bytes
font_02_sfnt_off0000ec1d.bin
4eb9e59e6bff429f33a0194c7ef88e1576ce31117204bf2b111c3c88b3c972a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 10644 bytes

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