Malicious PDF — malware analysis report

Static analysis result for SHA-256 db13a641b3d31cfc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a975948fa7cd1c16edb00b278892e09f SHA-1: 56bd39ef097ed32dd344f86f08ae0d8ee967e13b SHA-256: db13a641b3d31cfc645ba40ef600734bfb5c6563d9fe5f5c248eb56e02e251b7
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 domains and are structured as link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=white+christmas+pdf PDF link annotation
    • http://skogsformedling.se/bilder_umeny/File/zojenubunezulixen.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/noporusebegija.pdfIn PDF document text
    • http://hingliltd.com/userfiles/susizesopu.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/77131387718.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/45115689597.pdfIn PDF document text
    • http://z500.si/files/9169738649.pdfIn PDF document text
    • https://soechi.com/userfiles/file/21452809512.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/jemilekixegorema.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wopobu.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904145037.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/69955040522.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/jotedi.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/posopapelemi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161315f687aaad---89486705352.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/43570077901.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/83656010455.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/31184485192.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/76e116cd7d9bb33c58f5edc2ab8a3f8d/voxirebi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/tavosu.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/38202959700.pdfIn PDF document text
    • http://malifer.hu/upload/file/torizanoxotovibivix.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gejekenawalunafunagirijij.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/13571641044.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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 18324 bytes
SHA-256: edce7e3d8ca74003823ad8f07c415e31a35b6a84f272a1b0c6f83e1eae1cd853
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10608 bytes
SHA-256: 3e8d264dbe821b539eef96b6a9c54df75e8b46f884271f4278fda61fefdc728a
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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