Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd0a91e206a7257…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 05:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1a1458469863da0bb450c1f8ee797d4 SHA-1: ca350c1cdddcbca2b01e35450fe50750f4bd00b6 SHA-256: 5dd0a91e206a725762880affbe824bfef3d25b4c58631741aff9f04839bc4fec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://problemconsulting.com/img/download/files/zogufetofinimirud.pdf In PDF document text
    • https://apra.pl/files/file/zidonatafamagurokuzapek.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109010603509842.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/16189503526.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xewobuvaxobemujib.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/28969682017.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/39046322874.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/potefujebefukibabawizeje.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/79255599202.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/88750738536.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/21027627366.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/59771859605.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/31368221198.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/kojonunutaje.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/mefapu.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/rojelumewisisidan.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/tuvekexobosizawosuwuvaw.pdfIn PDF document text
    • http://szwygs.com/upload/zawojunomunizexuma.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/widut.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/99807021238.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wavifesano.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/waduvugajodipabomibuxu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/wusotalepamoxapajir.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/sopunoropafinaxekodoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=window+cleaning+app+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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 10500 bytes
SHA-256: 6bc83362e4f28652175d8020c5cb229684f7ec0b9514a7bff7d82d86a254ee16
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 17528 bytes
SHA-256: b67d0e1e0f4cbbc766474e1398d66dadf348e52f2194be982b367a6e3bb216cb
font_02_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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