Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c9c81ab154178a…

MALICIOUS

PDF

91.3 KB Created: 2021-02-28 20:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55906f49efa10e21bee06978ec0d63de SHA-1: 4af2e6de0c748df7d35b258e53cb4e5e30fd8738 SHA-256: 87c9c81ab154178a828fc4a2ebd3a7f6bc79b5ad77626b60bfd9cfd509dd49cc
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The embedded URI points to a suspicious domain, likely intended to host a phishing page or further malicious content. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/wix?keyword=vex+robotics+team+names PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5ff26dc4de5c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_600c7391c775e.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/RCOGV0S/70190799351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5fd9c82438659.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/79817718580.pdfIn PDF document text
    • http://jisuwadizo.22web.org/93582880088.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/fZMtMic/mp3_remix_maker_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/Fjdzbhi/xuzuxurosebadas.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/h7jijgd/texufag.pdfIn PDF document text
    • http://ruxipivufaditij.22web.org/4668555591.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/jesidofefe/lalubirukojog.pdfIn PDF document text
    • http://tavopaku.rf.gd/saxinejafufovokabotabew.pdfIn PDF document text
    • http://sevuvev.epizy.com/92988220034.pdfIn PDF document text
    • http://sulumasofip.epizy.com/8658778999.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/australian_dietary_guidelines_during_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/nyx_cant_stop_wont_stop_concealer_color_match.pdfIn PDF document text
    • http://zopefunexot.epizy.com/hunting_simulator_switch_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/bal_krishna_ki_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/wholewheat_lasagne_sheets_asda.pdfIn PDF document text
    • http://rirukezuruxemuk.epizy.com/hitachi_roku_tv_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/lenexetujunedumotomoresi.pdfIn PDF document text
    • http://pugunexipidil.rf.gd/vevuxerifapovijuwilatiba.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_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 5084 bytes
SHA-256: 774f2d43ad5be6f7ea1007f7d8f5014b1c1535a72f24d95895228ffcd703270a
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16032 bytes
SHA-256: 3f1a6dea9bc344d7d3c491382dd14a38fc44016390b427b1623a1f3494867d6c
font_02_sfnt_off0001487e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487E 16124 bytes
SHA-256: 064e8d2a3df827d25eff5b7dc2feefba53ed0e4aa0099414862b30355296bb3d

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