Malicious PDF — malware analysis report

Static analysis result for SHA-256 44763d085c4e78d1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 21:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f25fd793f3b490ff7a04aa7837b02bdd SHA-1: 640dc61b9cf3ba648ab919467f9615dfd73607fa SHA-256: 44763d085c4e78d19bb223971be237bcba8e686719e90932a9371c551032d931
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://giprozdraw.ru/ckfinder/userfiles/files/34795219441.pdf In PDF document text
    • https://posh.hr/files/buzoritekok.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///siluwez.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xakeboxivezajogago.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/33948069016.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/vetizoxu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/79361616317.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7ca03f66---fukidexowo.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/dejuxilibigatasuzasapufe.pdfIn PDF document text
    • http://agro-partner.com/Image/files/24078811075.pdfIn PDF document text
    • http://thaide.org/userfiles/file/81136373597.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/videkak.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/3406778191.pdfIn PDF document text
    • http://montesantangelo.it/files/files/10491505910.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/tavizifibatelijewuzaziwo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/22909051580.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/tigisogola.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910220252404020.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tagesixafojigurivasaj.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/84960050389.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/31988952484.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/witumolijutogiwa.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/95404856278.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/dadotudemele.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/sovon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=windows+7+home+iso+download+64+bitPDF 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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 10928 bytes
SHA-256: 770c1bd325ccf87c3567bea87fa23ea2c4244545ce975f9c412569db1b43e55b
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 17680 bytes
SHA-256: 074d1a598f31ac81672414530aa4a65458a5c1a7fe7e686d2ecf6a50563d70b4

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