Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a272b4395d8635f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 03:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 009d2d062faaf285e0de3f87db3e4287 SHA-1: 06c923e143852be3d457e6c2fa68785682c26e50 SHA-256: 7a272b4395d8635f9827b5dbf3724c6cfe5608bfc52eef72a254cbf24e69a7b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, indicating it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=name+smartphone+brand PDF link annotation
    • https://wineart.online/userfiles/file/40160643037.pdfIn PDF document text
    • http://htwy.com/upload/file/sewape.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/82146869698.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jozugaz.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/52799903342.pdfIn PDF document text
    • http://lawngo.net/fckfiles/93399520840.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/pivisunupimawafafo.pdfIn PDF document text
    • https://aashianarealty.com/file/mamiximil.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zamofudupevezimuxosekugos.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6a0b0b89---zowijifupesilara.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/40576185796.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/kisalamakuse.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/23669516682.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rixezagobagaveva.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/nakiguvanowupidukolasit.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/selamuvidebemenitaka.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/85272724084.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/pawobebisave.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/8139956839.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614a4475ac03c---23869845287.pdfIn PDF document text
    • http://chinalabware.net/d/files/99338684173.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/xarifafoja.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_off0000b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 15364 bytes
SHA-256: a50e918e555cbe92a998732d69a9db6d9511708c57d0af79d6aa8329c7cd98e2
font_01_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 10636 bytes
SHA-256: 3b5abd3dac19618758eb26094049f5cd6e00802aeaf542bd985e9820d08a2e42
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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