Malicious PDF — malware analysis report

Static analysis result for SHA-256 d302b88b9c3c1ed0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 00:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcdd86271105e30c680b8a8d997da682 SHA-1: a110cca329fdb5ccb18242c81cdbbe6ef47d1ccf SHA-256: d302b88b9c3c1ed096859ee8a574932a7da56c31adadf26516a3f0b7316c9b0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, likely to obscure the ultimate malicious destination. The presence of external URIs and a 'download button' heuristic suggests a social engineering attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=s2d+multiplayer+mod+apk PDF link annotation
    • http://ampletrekking.com/userfiles/file/sufanaxu.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bimonosazidigexujan.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/73028013073.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/37600348133.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/garetefidagi.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xofejijokobukubidobixelu.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/49725972704.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/97195689202.pdfIn PDF document text
    • https://langumeistras.lt/i/File/dasekapofekixi.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_9192E7D6BEE613C6.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/868485925.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161348c11030ce---84234689566.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/pizurilimavisarage.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/tunuziwuvewofazit.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xigototitipolagexa.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/5488864377.pdfIn PDF document text
    • http://www.og2c.com/images/file/14172714034.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/72772641535.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/25972594502.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wejufawikusisiri.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/bonamiwawaguxabu.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/9906967530.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/42641042885.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_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 10780 bytes
SHA-256: de865d4c1faccd11d2bff3780dbf21fa4cad29fe087b22e18fefc7ea3277124e
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 17996 bytes
SHA-256: 4782dd043852e69b6e4a69a0da34821da6f54daf768d079b60deb1863127f0e7

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