Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6841829762e2fa…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 18:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08e678d89434f781d5bf92f00320fd41 SHA-1: 77fbb0f51ee76d468415529cfaff7fe2201574c5 SHA-256: 9a6841829762e2fa56aadd9e20aba828549b571cab4202d3c6b352c9dd99c517
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 identified as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URI heuristics and the overall structure indicate an attempt to direct the user to external content, likely for malicious purposes such as malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://de-ko-gmbh.com/ckfinder/userfiles/files/99278095921.pdf In PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/88563415657.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/besidavuzopikogijigifitas.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/51307484388.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/navuv.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wizosul.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/vexunolikaduxujegavuv.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/sepovanizopuwifetevomilom.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/69147126840.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/26166971715.pdfIn PDF document text
    • http://hanshintech.net/data/file/nibopudolotojedexubiwug.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14561259137.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210910141002.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/51231285905.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/porabavuwukoro.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lelewuxebufuritokevaxo.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907054540.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/dozawotiwig.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/wanif.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/fafexeg.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6tmdp86etrc430cl24979s98ig/8952496268.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gomer.pdfIn PDF document text
    • https://maymac.info/userfiles/file/3954689164.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e4621949---jumobuzote.pdfIn PDF document text
    • http://i-dron.cz/data/file/bisofifodexapiwatam.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67204119228.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wijubevojeko.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/16375440392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=prototype+2+game+download+for+android+phonePDF 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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 16324 bytes
SHA-256: b08b5bd85cf608483845a0f1dc7245550bff36ded90082a143337e0b14d824f9
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 11100 bytes
SHA-256: e97a3b5aa394363d8e802f3d89f7b6f1cca5cd1eae5147e36926207a10a7bcd3
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1