Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ba476dff374f2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 21:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06ff2b45d6e598514701e9cddd19c0d0 SHA-1: b1589b9b385faa1c150ca4957c3b276453665233 SHA-256: e88ba476dff374f2e5267721e3ef4a6769d543e6d4b9de2f192bcd4da9cb1df6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm hosted on disposable domains. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=change+sms+center+number+android PDF link annotation
    • http://itexpertdog.nwoasis.com/upload/files/13686063125.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/genuku.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/guvanoliv.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/vegiwagugumab.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/dadowujemevowom.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/milibawise.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kilel.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/duvowovaromigamelonopemat.pdfIn PDF document text
    • http://beta-rc.com/upload/files/61595252615.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/mazevosigexo.pdfIn PDF document text
    • http://wdnederland.nl/file/witebewigid.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/nutisupalerib.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/70166715462.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/34677774202.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6e0f10ef---62480751154.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/biramuxivomamezom.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/46260451230.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/86544114749.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/61d4a691bb4c45544b6a74cb21075e0c/31420888767.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/71426214639.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/wofepivolofovanadem.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/dovifeseletudotabok.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/lokonogupesawur.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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 18176 bytes
SHA-256: f516a154b6943e4ae85093c0bf45feb60402b9f43abdd8839a1aeeee477b2b5e
font_01_sfnt_off00010a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 11044 bytes
SHA-256: 1ba42f3d7d4451b1f81e847695750a733497164c6972f72b2f613995280ccfe3

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