Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab22a0483e5abee…

MALICIOUS

PDF

75.5 KB Created: 2021-10-13 01:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a39ad3299fad1ee4292b38b8e0f0bd9 SHA-1: 91f597ba028a876a85aeacae0c4602ea863734c4 SHA-256: 6ab22a0483e5abee6bcaca8634a9e6c46ca3fcc1b892cef6b6e5ebf40dbcdc40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ans5680.preneed91.com/upload/files/80557907156.pdf In PDF document text
    • http://ncdesign.it/userfiles/files/sikukoraselomax.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/9951864859.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30945360248.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dc72cqs0rmqs62dipia4j3m8n1/vatodikorixuserotixij.pdfIn PDF document text
    • http://traviet36.com/upload/files/79614410628.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/38239340718.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/butefonozineripa.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tedefatudafoxu.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/49011706895.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/lagoreperewusatepemepugu.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/5516943594.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68676836141.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/bokirogos.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/28533751015.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/65874240083.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/59747289646.pdfIn PDF document text
    • https://megashina24.ru/files/files/61635672228.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210918042437.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/41536484677.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/tosejusu.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/burosekaj.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161541e373e268---22529423745.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=hypothesis+plural+englishPDF 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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 10736 bytes
SHA-256: 81347e98390a8948cff9e63bb6009c9667c2b3afe9ec2d3f4f14d2eb3e293c1f
font_01_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 18388 bytes
SHA-256: ff7b2de08436808a24744e28e3416978772cdae1f142aa53ec33f15aeeaaabb4
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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