Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce51224a206163c…

MALICIOUS

PDF

95.8 KB Created: 2021-09-13 06:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a4adcf36b85ebaa7616eb2c5348c6bb0 SHA-1: 518b8a4df09b9ef65ace85e79345976cc5278e9c SHA-256: 0ce51224a206163c161491efe63b435cf5657739745ef9e2493963bb2bdc5ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://invismortgagebroker.com/images/file/ragorolatu.pdf In PDF document text
    • http://a-aqua.fr/ressource/site-image/files/ponosexifuxirawi.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tasadanenekopuxaw.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/81729209949.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/13622833635.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/3682241748.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jukufaxikaripalovewikajo.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/82657951463.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/jejufakazija.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/efdeb65402e7657f7297fb7e2eed43e8.pdfIn PDF document text
    • http://coachhouse.info/assets/file/bodasiti.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/9791018094.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/dogizadexem.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/waruxemobuxitilabivowip.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/61029070896.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/30145149427.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/bonemirojuruwejukez.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/47012777892.pdfIn PDF document text
    • http://domainecomps.com/documents/files/12170097360.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/golefow.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/40073571335.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/motudokolosedonipatufew.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/jomepajajuzuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=clash+of+clans+wall+upgrade+cheatPDF 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_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 17736 bytes
SHA-256: b9251d04f29216fb20e8cc2457dc3a4c24a72c42428a7d458cd3f989a1c72113
font_01_sfnt_off00013fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157ED 11024 bytes
SHA-256: b1098cb114263e54fc4a942ee5565a672191963649fc6a4fee01343f81bac88a

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