Malicious PDF — malware analysis report

Static analysis result for SHA-256 78617fbd66772890…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 03:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd589793f01ce8a0a0f7e289fc011dc4 SHA-1: 962563cca1a1f06e8c63ed50885e5b553f4def91 SHA-256: 78617fbd6677289066d23ab123f85a5ca0469f4fb4cbbfe197d9d06acaa6fae5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

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://oniceh.ru/uplcv?utm_term=dise%C3%B1o+de+situaciones+didacticas+laura+frade+pdf PDF link annotation
    • https://okazdedziecko.pl/_files/Media/file/nudusofiropazuselulapa.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/mototavuwe.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/89212950883.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/18/file/98704991375.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/tuzutij.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/pudadesafovudesapoliser.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9625e09a---zugabibejixevanafewurukiz.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/22048067782.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/22668361336.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/vepibifepititibeduwozir.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/27278965127.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/4456237220.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/gofofobid.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/rugegatibegoxuvuwafukuv.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614389d0dbae9---mewuteve.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913065257175.pdfIn PDF document text
    • http://aquatherm-graz.at/files/59235539065.pdfIn PDF document text
    • https://petek.biz/resimler/files/3248640511.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/gofaweverujowigijuj.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/niwarorowit.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/42781311375.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/53118351263.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/xabupivixutonanikixub.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 15384 bytes
SHA-256: d6eae3b654b391dc2d0704e659a1c00bac724c04b816ec0fb8b2dbb231f38bf3
font_02_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 10920 bytes
SHA-256: a1e6efdbdf2f658257d969e0d5693f0f2d03d693d6047918802c0c0166a61e6d

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