Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c3f114fd57ae14…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 06:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9fd4313028881eb03f038eba7714fe48 SHA-1: beb0368737fe9c8367f25be6c181dbe1445763b4 SHA-256: f3c3f114fd57ae149aab9245cfb9f4a3ca050724a948c49be2668d64b85c1abe
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URL pointing to 'maypoin.ru', which is likely used for phishing or to serve a malicious payload. The document body, though heavily obfuscated, suggests a lure related to 'piano notes for tamil christian songs pdf'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=piano+notes+for+tamil+christian+songs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424645/normal_601f2de905173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_602f816bcd0c2.pdfIn PDF document text
    • http://fovorowo.22web.org/waste_management_and_research_journal.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13068ff9-a7dd-4b2b-9a06-14fb3b0b06a2/how_to_install_parmak_solar_fence_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/dog_ownership_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/30575682969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8f1ec7-f332-4a7e-b396-864ee1bc661c/vubulokobupexuxifemop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e99a4f6-2e34-44b2-9b44-2ded7833d86f/the_secrets_of_underground_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ce37a7-fbd2-432e-9a3e-8084b35674d8/86252316596.pdfIn PDF document text
    • http://nitesegu.epizy.com/rocket_league_cross_platform_steam_xbox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02889c9-18f1-4e23-bf43-a87c197f1a6c/1001_classical_recordings_you_must_hear_before_you_die.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bernal_daz_del_castillo.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/nujulegamigaje.pdfIn PDF document text
    • http://kopixisaxet.epizy.com/bailey_and_love_27th_edition_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13fe85d8-816d-4c7a-a84f-15617798a6e6/yard_machine_16.5_hp_42_review.pdfIn PDF document text
    • http://bemurulorax.rf.gd/39793853236.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/best_sale_on_beats_pill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbea29a4-f140-4c54-b00c-1f229d0d3eb5/descartes_meditation_5_sparknotes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e358.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE358 13952 bytes
SHA-256: 6c56ec7603d2e003a727fa3867c369cafafa72328796caf8c7511f2f5f029608
font_00_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5568 bytes
SHA-256: 002c540d1df90ea0071b944ee2351d4f3d297cd8594ec2537a3dbd54ade09126
font_02_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 10380 bytes
SHA-256: 1d5b9066033c3e62c720062577d5f58e671c0839bf64707b87afbcbe77ee3c45

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