Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd44289d91b1d7b…

MALICIOUS

PDF

68.8 KB Created: 2021-04-04 16:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a2fd18c2b481f9704d0908197f24fb SHA-1: 51a430fbe45388d7ae521cbf4cf998f0c516788f SHA-256: 9cd44289d91b1d7bdde137aba8628b3ea4423fe64a8f30f728db35018d561d1a
104 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and a machine learning classifier with high confidence. It contains an embedded URL pointing to 'nipisod.ru', which is likely part of a phishing lure. The document body, though heavily obfuscated, suggests a pretext related to 'effective technical communication'. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/award?keyword=effective+technical+communication+rizvi+pdf
    • https://static.s123-cdn-static.com/uploads/4481821/normal_5ff711cf712dc.pdf
    • https://cdn-cms.f-static.net/uploads/4469104/normal_606872663d81d.pdf
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fc82664e9b07.pdf
    • https://cdn-cms.f-static.net/uploads/4455194/normal_601e0a9411c62.pdf
    • https://cdn-cms.f-static.net/uploads/4420592/normal_6056a9023fab5.pdf
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5ff9ccf3ef84c.pdf
    • http://sixobenuzapezi.iblogger.org/sezurugaludulobiboxi.pdf
    • http://eyebrowthreadingdallastx.com/fabesumorexevigezatope2jmru.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd679a63a880.pdf
    • http://kawlites.online/hamilton_beach_flexbrew_thermal_carafe_replacement14wt2.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_601f9d9ff4059.pdf
    • https://cdn-cms.f-static.net/uploads/4402501/normal_6062376c8e8d5.pdf
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf94c05eb3a.pdf
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5fc5c8d607686.pdf
    • http://rakakap.iblogger.org/best_islamic_quotes_from_quran.pdf
    • https://cdn-cms.f-static.net/uploads/4486061/normal_6020839f9f06e.pdf
    • https://cdn-cms.f-static.net/uploads/4388280/normal_6063f33a0f6fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puteruwegadijem.epizy.com/flight_simulator_2015_pc_game_free.pdf
    • http://sidogin.epizy.com/oxford_hematology_free.pdf
    • http://pigepitusedotet.rf.gd/why_wont_my_firestick_remote_work_with_new_batteries.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d082.bin
028104f203f39324bf4a951c4c18867293088097e9001873c91a02e7c4d5ca08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 5284 bytes
font_01_sfnt_off0000e26b.bin
41c47f93e83919996abb518d2089e825b59e86b8276314a262818afd515edb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10336 bytes

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