Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecb75f4caf4be00…

MALICIOUS

PDF

82.8 KB Created: 2021-03-24 19:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5632f5c81ea9d686dc2fefbb758faa3 SHA-1: d1bc0b5580552ad9e5f1011c861f769bea18b3a8 SHA-256: 3ecb75f4caf4be003590f8c1e49e1ccebb149480bd9e3daf1ed3cf73e8f028c9
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that points to a suspicious domain, identified by heuristics as an external URI and flagged by ML classifiers and ClamAV as malicious. The presence of this URI suggests the document is intended to redirect users to a phishing or malware distribution site. While no scripts were explicitly extracted, the nature of the embedded URI and the overall detection strongly indicate a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=case+study+methodology+pdf
    • http://rugegav.mywebcommunity.org/rules_for_cribbage_for_beginners.pdf
    • https://cdn-cms.f-static.net/uploads/4494673/normal_60199ab1449dc.pdf
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ffd0da83cb9a.pdf
    • http://witaxolexigabi.mywebcommunity.org/oxford_picture_dictionary_english_sindhi.pdf
    • https://cdn-cms.f-static.net/uploads/4452377/normal_6010930f478c6.pdf
    • https://cdn.sqhk.co/wanadujogo/qRieWgd/36157585055.pdf
    • http://bottlechainworld.com/fluke_771_spare_parts8xisx.pdf
    • http://ketosimple.online/98958428221r5ky1.pdf
    • https://cdn.sqhk.co/bipokagiti/TjjrLhd/8592476229.pdf
    • https://cdn.sqhk.co/rewazexi/ggdjaAY/roblox_gun_simulator_pet_codes.pdf
    • http://fb-ig-copyright.com/68493967721xe7w8.pdf
    • http://regsenatvumen.website/697276432333jwhg.pdf
    • http://dektesheff.xyz/felewerapobufyj0a.pdf
    • http://nemosixumeki.mypressonline.com/91149570871.pdf
    • http://businessmentality.com/oppo_a37f_firmware_free1jrzu.pdf
    • http://feldhaus-klinker-plitka.ru/68914794558e2lh4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/93125aca-d95e-43a1-9530-5a36631172d9/nipukifamoreg.pdf
    • http://tobikinos.onlinewebshop.net/who_is_simbas_daughter.pdf
    • https://uploads.strikinglycdn.com/files/a76295aa-c525-415f-8c49-203029b3637e/craftsman_platinum_7.25_190cc_electric_start_manual.pdf
    • https://uploads.strikinglycdn.com/files/ac5f1172-eee5-4a4d-b660-fb4b9b420392/76775444099.pdf
    • https://uploads.strikinglycdn.com/files/de8ec0bb-1a6f-46e9-ace1-635d02878d32/oracle_12cr1_download_for_linux.pdf
    • https://uploads.strikinglycdn.com/files/debfa241-a91f-4e82-b20b-82b36049105a/hp_photosmart_c4280_tem_wifi.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_off000106f7.bin
e302cbef7db79720578d7289cea76cdcfc971e90af7861aea3e5f02889da1480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 5364 bytes
font_01_sfnt_off0001191e.bin
1d8359d637229b0bfe45da7eaea47687d25e8f57b141323cf5a49dd52d36c8eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 10768 bytes

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