Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9318afd1d3c686e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 12:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e84ecd521eadde9ad2703ab395e4dfc SHA-1: 128c767b3fbccf4b4c6ca06f5d5dc331e60e0f18 SHA-256: c9318afd1d3c686e12ded5614d6773d123302263e2e5a647c52adb1c402ab2ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

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 https://cructi.ru/uplcv?utm_term=how+to+mirror+android+to+pc+using+usb PDF link annotation
    • https://receptabc.hu/images_banner/files/1463680465.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/wanetakekex.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/xenome.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/4714756488.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/18413009322.pdfIn PDF document text
    • https://naves.cz/res/file/bulal.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/33372078036.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379ab95061f---53710490961.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/mofusudujasibomuseta.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032a2c931b---38200537540.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/54558040358.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/makavizivovopofumibexu.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/giwowofagenu.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/84783560174.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/75732534633.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/20094727730.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/57125216609.pdfIn PDF document text
    • https://hssanesteban.cl/files/zinar.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/55215630621.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/26257083204.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/94047903346.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/nabubadon.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/wolulizudovurup.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 10996 bytes
SHA-256: 12dc12896f3afd15672a5c105483ad620de69933f47440af6e7268a818699fcb
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 17868 bytes
SHA-256: b968c1cbbbd997d1a9f25cbda8e00cdb9c4ce1b6caa0121867e68a2cd0b50d3c

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