Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a8d998b8651a26…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 21:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f01b8665e071211ea70ccbeb4d89826 SHA-1: 1d9195aee473e8b6f97617fc77c8a72e863a5e0b SHA-256: 04a8d998b8651a2602688c3a1e7e36040d2a540ea2dc231619855c8b1722fc41
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the sample for this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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://irlanc.ru/uplcv?utm_term=unlimited+ultimate+car+driving+simulator PDF link annotation
    • http://hndgyl.com/v15/Upload/file/20219544973078.pdfIn PDF document text
    • http://canadanur.com/resimler/files/bilofukojizen.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zudunanuxasesibebew.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/dasixesoxoji.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/68957325829.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613465adc4fd0---53229360957.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/zunuwanunesefanoxelekuvi.pdfIn PDF document text
    • http://kco.su/userfiles/file/91169570331.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/211367faf0f9d47e5b3faf0954a3d30f/vozepofalajotu.pdfIn PDF document text
    • http://nessium.net/userfiles/file/rizupufumuguwozirubojefi.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/nefaxazirulunaletas.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/vutopimareb.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210904130805.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109071706584964.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/mesaxogevejo.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/3276516062.pdfIn PDF document text
    • https://ubranni.com/uploader/files/xaxumufifowuw.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/piwixoju.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/gosoluxebujawo.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/saburevidetirixi.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/59728609986.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/josasipifesaxifu.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/18153424228.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/fovagukenedajotadew.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_off0000d6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10888 bytes
SHA-256: 940ae78e0464481fd23340adada0d9784e67fd6f8f5cd2c3a6c9cac8f0114358
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 17956 bytes
SHA-256: c3f7e53a270eaf9dd9ffd42b2c7e32ac61347ecdf200e61c1dfec5a3c3ec3b19

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