Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ecb12a21f243d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 23:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db010c8f43e6bd7204ef2b947e1c77c7 SHA-1: 78bf733020e153d241bb0617d331ffa6a622efa3 SHA-256: f68ecb12a21f243d0e4ed324c3424acc37de467ecd40cdee2975f19820116ec4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the presence of external links suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=create+dialog+in+android PDF link annotation
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/pukapabosomisegades.pdfIn PDF document text
    • http://secretinvitation.net/images/files/67510521320.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/86158796623.pdfIn PDF document text
    • https://oferta.lt/i/File/93842393975.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotitorogipe.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391e1adb949---12745226738.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/dapotidiwudejavub.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c125450e---malekobesulobadoneguv.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/venukaxipujulapinafov.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/xenovivik.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/pufafixudezakafodufi.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/forejifuzurinivejegod.pdfIn PDF document text
    • https://domilot.com/uploader/files/mozimaxuwaz.pdfIn PDF document text
    • http://poiskvod.ru/images/file/75021840587.pdfIn PDF document text
    • https://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/70443623302.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/10259863232.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/17089551987.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907034733_299074428.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xigoxososaxapujefimo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mojolakedaw.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/42705249756.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/diwibutexekuvonutim.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_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10284 bytes
SHA-256: 6e9be00ce6a3a7da8ad0b507a693c6cd3dfe19d532cf8325e3502fea2453082b
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 17620 bytes
SHA-256: 359208b262e4dfcc8ed7e7c2eb8e1def21fd027ef5ba4508fe3c426a668a4df7
font_02_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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