Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06951953073c11e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 06:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a6bd6670c5533fd05d81a9a10eb041f SHA-1: d726d0e055f6ccb2ce2cf139ff4eb3e4fad1567a SHA-256: a06951953073c11ef0e7cdc440ef63561a6d7b1a59d4abfbb7e1792f799d1b60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest a malicious purpose, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=lock+phone+after+certain+time+android PDF link annotation
    • http://hujiangsy.com/upload/files/zatunepejuganem.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nogenutovesebomot.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62092377479.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/26586990116.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/68368026639.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/47780744983.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/xojab.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jaleva.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109190858156663.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/lunegebuvuzuvu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907072403.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/nipimoxotegisokumufikopu.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/58432156293.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/51096705145.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/zugorewujaxiviripujogipom.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/125661372861472e0d6728c.pdfIn PDF document text
    • http://apple888.vn/luutru/files/63054384694.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vawamubafisuvenabimi.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/7349576945.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/muneferu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142984a77a68---girigumugigapuvavanelo.pdfIn PDF document text
    • https://bloc-immo.com/images/99849743270.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/fikajirunegudif.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318018d2d66---18050550163.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 17172 bytes
SHA-256: ed839170aecea183e10a73e5c47efd1c3463d375e9fa4f20b9c17a340885b076
font_02_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 10720 bytes
SHA-256: fb3a0d8e3ce29640379f18e1daa616cee17de053f3a7492aff59b2af5422194f

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