Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a5845452850e2b…

MALICIOUS

PDF

93.1 KB Created: 2021-09-24 02:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1fff1b8aba7f92f8109825394fdcea6 SHA-1: fc961fef85d0f67bbfa50da6af9dc48ffdc5f810 SHA-256: f7a5845452850e2bbdbbd5d1497f2b17694e403060f0771d2eea19fdafd8783b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The primary lure identified is a fake firmware download for a Samsung Galaxy S7 Edge, directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=samsung+galaxy+s7+edge+firmware PDF link annotation
    • http://kmkonsult.cz/userfiles/file/texulikakuwixep.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/kobewed.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/tonifomanotowal.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jutunan.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/bilakinigudojaf.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/gipuve.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/rivumukovukupivekazaze.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/57009447289.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fimilu.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/fuvikinef.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/69180422462.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41728863314.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3f4c5c82---lemujebugegopojitenejol.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/98064069345.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/femapofelenik.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fugojuwivafutebezerojeleg.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/86806889758.pdfIn PDF document text
    • http://aromata.ru/upload/files/fagobafejilarozedil.pdfIn PDF document text
    • https://italvaping.com/file/tivubogejura.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/65c2674f5d6772367b91ce70e832075d/xobenikutibimon.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/pegirufimedobejifuwuvop.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/safora.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/991882011.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/linarogetub.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/10571400375.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_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 16924 bytes
SHA-256: 3ba6fb68ab16da3e9d7cc9a9fe8ab52b71c4544d320fc6f58eacc3a9e473704f
font_02_sfnt_off00014d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D28 11004 bytes
SHA-256: a6aa82c74b625e857709ad0f626f9239ec8eff20f612e21a950296c5a550cefb

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