Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed42e0ce5abafca…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 22:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6dcbca9c38885ae5cd1f56ff5127ccd2 SHA-1: 8b2f739a79d60bbe23c1a402b09a7c97146413c3 SHA-256: fed42e0ce5abafcac05b4c5b37be4fd34ff9ace9bc01b4bd16dcc4549d9a7bae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous embedded URLs suggest a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://z500.si/files/22301785859.pdf In PDF document text
    • http://enricobarraco.com/files/dobijokivo.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/kagirokijewutomoranaj.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/13810160830.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/18616085461.pdfIn PDF document text
    • https://5udua.com/contents/files/85865541510.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/61436196502.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33044807616.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/58956569846.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db08ceb079---xupub.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/6909804532.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/zaxevobanuzo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/dasabefewatelalotik.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161466eed6f9e3---16183552650.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/40271279585.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/xijomugi.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/75017735273.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/taroguwuxiw.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/bufopojef.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tolulu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/rosovisu.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/lezurepofosurefewojed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=picsart+apk+for+pc+windows+7+downloadPDF 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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 10712 bytes
SHA-256: e2b1bde4a1c957fffa6286a2b3a1d6f6b180fe675c75cebcfe581d17e2aa1d46
font_01_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 16364 bytes
SHA-256: 334fbe0efc8b02406741d330b1f125b1593f7c861a1db3b67f9f2bf60dd4d388

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