Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ac48bad8a0e58f…

MALICIOUS

PDF

74.4 KB Created: 2021-02-19 17:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7c8551e747ae67a2f5fb7017e6d82e97 SHA-1: 38fb78d60680f6f3c6d927cb5a8f49305e0c53fc SHA-256: c8ac48bad8a0e58f9495b6be1116c153a4ec553ccd500e50ce124de8ee318a9a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URL that directs users to a suspicious domain, masquerading as a philosophy of science PDF. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or trojan activity. The presence of multiple unknown URLs further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=okasha+philosophy+of+science+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501364/normal_5fddc2d84ae31.pdfIn PDF document text
    • http://newyearshop.site/470302296629iii0.pdfIn PDF document text
    • http://mini-camera-super.club/6157536194696i6j.pdfIn PDF document text
    • http://znohist.site/90991130028gfogo.pdfIn PDF document text
    • http://present-mag.ru/xafuvibukadumonuzedexnd3cl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/the_birchbark_house.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/gatudu.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/information_constraints_on_auto-_encoding_variational_bayes.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/best_free_textbook_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/lolexajezetabazu.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/48378098358.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/babri_masjid_bhojpuri_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/dupuwalavetisubebu.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://scripts.sil.org/OFLIn 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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 5340 bytes
SHA-256: 99c1c5db698f20514e94c6f437979c40e398db74f7c63745e3a694038833edac
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 10376 bytes
SHA-256: f14a591fe8c40748826375439bb9037b2674b6b0468586b4f3049942f4a4c5c4
font_02_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 16300 bytes
SHA-256: 9b657b0482a16fffc92ed0b832cd25dda32ed730fc436f27081966d08120d812

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