Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1361c159a589479…

MALICIOUS

PDF

82.7 KB Created: 2021-03-23 21:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ccf3d0de00586c5d8dc9243aa718a04 SHA-1: 7026742871f95459112ed940fd41d0c0d136c381 SHA-256: b1361c159a589479278304b568b1b075cb5d90b5c2dddc31871cc3eab0ea96f5
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=ffx+fenrir+guide', which is likely a phishing lure. The document body, though heavily obfuscated, contains references to 'ffx fenrir guide' and the authoring application 'wkhtmltopdf', suggesting a social engineering pretext to drive traffic to the malicious URL.

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://jacksth.ru/wix?keyword=ffx+fenrir+guide
    • http://xelasurugopu.mywebcommunity.org/45911762166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wiwazisumi.rf.gd/deparizizemusireto.pdf
    • http://tuxusar.epizy.com/casio_wk_500_weighted_keys.pdf
    • https://uploads.strikinglycdn.com/files/f22eda2b-ad4b-4d75-8df8-cc9f8a15875a/lorozafagutevifopu.pdf
    • https://s3.amazonaws.com/wukara/carsguide_ford_ranger.pdf
    • https://s3.amazonaws.com/xesigeze/what_is_the_hardest_boy_scout_merit_badge.pdf
    • https://uploads.strikinglycdn.com/files/80b05a35-eb04-4efa-acd8-c8c22c7d7d51/90s_dance_hits_song_list.pdf
    • https://uploads.strikinglycdn.com/files/eafb2bd0-29de-4c76-92f4-50a28e8eece7/acordes_mayores_de_piano_para_imprimir.pdf
    • https://s3.amazonaws.com/zubuwujoxom/troy_bilt_storm_2410_engine_oil_type.pdf
    • https://uploads.strikinglycdn.com/files/f96edfd6-8763-42df-8fb7-0e2b090b06b8/9223216108.pdf
    • https://uploads.strikinglycdn.com/files/f5767f36-2ce7-4324-b8ad-e52d2874ebac/safometerezojujepokovigat.pdf
    • https://s3.amazonaws.com/bulujono/jibutokineseripifadoto.pdf
    • http://newubopuga.epizy.com/what_are_the_three_types_of_zodiac_signs.pdf
    • http://xomapagovujux.atwebpages.com/how_to_attach_dremel_attachments.pdf
    • https://uploads.strikinglycdn.com/files/435df9f2-25b8-4774-a0b9-352ef61bc09a/hayward_t_cell_cleaning.pdf
    • http://xabazuwodumodo.epizy.com/surah_al_waqiah_arabic_text.pdf
    • https://uploads.strikinglycdn.com/files/de886098-b248-4d73-92b7-f29ff34937d7/86475721350.pdf
    • https://uploads.strikinglycdn.com/files/b2310792-8aad-4bd5-aee1-88028de18ad4/12560650449.pdf
    • https://uploads.strikinglycdn.com/files/800f6972-c386-4467-aa3f-fd1953e4d7aa/48664037030.pdf
    • http://maretazijedoval.epizy.com/18883573110.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39f.bin
790da4563849e8d6be036dad8717846678f18dfa4342e49c9bb452509c3cd072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 4372 bytes
font_01_sfnt_off0000f27d.bin
de1f310da2b8763f1169ffd4f51ec8daad2c7712bfc3fa22c2d9b3a38c1b2846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 11896 bytes
font_02_sfnt_off00011a72.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16092 bytes
font_03_sfnt_off00012f39.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F39 4324 bytes

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