Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db2c0438035b1c…

MALICIOUS

PDF

298.0 KB Created: 2021-04-04 11:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1ee776baceca2c1b9875529a289b88f4 SHA-1: 45bf0b739b3b43c732f2dc5309954d9d3107320f SHA-256: b9db2c0438035b1c715f7b8f768ff236020caa3a8faf2d1b0ae7d74ab873fce6
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. The document body, though heavily obfuscated, contains text related to PDF creation tools, suggesting it might be a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=el+libro+de+mis+oraciones+heriberto+pdf+gratis PDF link annotation
    • http://shoop-fe.ru/cost_flow_assumption_vs_inventory_valuationrm5z6.pdfIn PDF document text
    • http://limaxinsto.xyz/46641848580xoszn.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/digital_marketing_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/t7giggE/61327780557.pdfIn PDF document text
    • http://todomod.22web.org/binemev.pdfIn PDF document text
    • https://cdn.sqhk.co/kojivitew/gA0ihCj/puxutelobujimepi.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/author_s_purpose_activities.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/66396338561.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/american_gods_season_1_episode_3_full_episode.pdfIn PDF document text
    • http://zimemotom.rf.gd/schopenhauer_the_art_of_being_right.pdfIn PDF document text
    • http://fimuwixuxur.rf.gd/vonizivibezugotanino.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/how_to_pass_the_cpc_exam_2020.pdfIn PDF document text
    • http://supipagaj.epizy.com/b._s_bahl_organic_chemistry.pdfIn PDF document text
    • http://rotuvuduvixamek.epizy.com/how_to_get_a_mississippi_license_plate.pdfIn PDF document text
    • http://pusagulubuke.rf.gd/la_esposa_que_ora_da_25.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00045e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45E5E 5668 bytes
SHA-256: 9052e02205a33e0df5cd2fa10ef2f458517a5f0935ff8926f358b84b66fdfb33
font_01_sfnt_off00047179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47179 12576 bytes
SHA-256: 922dc705805d0215874bf1d4e027dc45d2b5c5246f6dfb9a085e9785df35a38f

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