Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b9e34a1f1b7ce6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 03:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 1f0d6aaa0629943d44f77014d539fe13 SHA-1: 20ca3f1667ee600d2320970d8c80267042bf2fa1 SHA-256: 82b9e34a1f1b7ce6df622c2f8df2b382546b6e895ee711feb62266b9449a1631
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content likely impersonates financial instructions, aiming to trick users into fraudulent transactions. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://hunglivet.com/uploads/files/202109050346497062.pdf In PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/lafovufibobifigavilajudu.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gekigerananemon.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jufuxu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/86947338946.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/77741246494.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mni1gp9ai3vddfflsccv32q487/65516921937.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/95704095866.pdfIn PDF document text
    • http://soles2walk.cz/data/file/61115749134.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/mejanin.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bijimubol.pdfIn PDF document text
    • https://cooperspick.com/files/kifodamawipo.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/99166997029.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/goxepi.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/kefajukexekapozoromawuno.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/sutuzafepudulogav.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/jebanurobuvuxa.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/vabipuxiruvidipexorewesoj.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/79519124567.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/zepoxinavewijomipew.pdfIn PDF document text
    • https://kueapem.com/contents/files/lazopu.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/peloroxetirowadajesuxobu.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/fuxanupesavigiburi.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/mabunizowuxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+save+contacts+onto+sim+card+androidPDF 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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 10628 bytes
SHA-256: 2ed603d1edbe9cfb9c2022f348c98a6bf77fab233fc1f10bf86bd2c76524fb15
font_01_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 19128 bytes
SHA-256: 0aad452c34f5c02b8c362037549d5bada4ae371a19a0090963328c0ebc4af7dc

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