Malicious PDF — malware analysis report

Static analysis result for SHA-256 121d74dde98a2aae…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 18:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8dc0f873250893a8114fc5c9790079c SHA-1: 6289392316b61f45bb50776fd340f573030c82fa SHA-256: 121d74dde98a2aae39f4d20197aa8991d715df0d5b7136ad3ecec4f71b5d6081
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'vilenefex.ru', which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, contains keywords related to 'charter remote guide', suggesting a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wix?keyword=charter+remote+guide+not+working
    • https://cdn.sqhk.co/govazofaj/QjhyPdw/awd_cars_for_sale_near_me_under_10000.pdf
    • http://zavuwoxek.22web.org/tegelosixopunaxepepidupot.pdf
    • https://cdn.sqhk.co/pefibovip/hcoJih1/tasetumojid.pdf
    • http://pakirekugep.scienceontheweb.net/xadiwokaxotizikozar.pdf
    • https://cdn.sqhk.co/wazikunal/dheTYhf/board_games_programming.pdf
    • http://nadefememidep.medianewsonline.com/bangalore_city_pin_code_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/biwuwukesazef/19507075950.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_0aa7cdfcd9c44b7eadaf2d2966be8a6c.pdf?index=true
    • https://s3.amazonaws.com/nefunupu/zuxenosibixud.pdf
    • http://sisufovofow.atwebpages.com/history_of_english_literature_book_by_t_singh.pdf
    • https://uploads.strikinglycdn.com/files/ca9b3567-847d-4dbd-ac1d-a90e2e486e0b/bollinger_on_bollinger_bands_book.pdf
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_70d05e879f6e472a9f8b828377bbeeb5.pdf?index=true
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_446e1718741f4006b3cd4b9c7ee030ad.pdf?index=true
    • http://talifox.rf.gd/fanubugejagujeras.pdf
    • https://s3.amazonaws.com/tolivajupeku/the_significance_of_theory_terry_eagleton_summary.pdf
    • https://s3.amazonaws.com/moduluzuxikari/58376209969.pdf
    • https://s3.amazonaws.com/fupanabivote/m._a._b._t_full_form.pdf
    • https://uploads.strikinglycdn.com/files/a419dca9-ab0e-4279-b3c1-3e1fe08fccb0/3963061186.pdf
    • http://sojidalome.rf.gd/frigidaire_front_load_washer_parts_manual.pdf
    • http://xabudavadeguvo.myartsonline.com/beowulf_poema_en_espaol.pdf
    • http://suxanovovogemi.rf.gd/asus_drivers_update_utility_crack.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_be5c59d7ae0c4a8bb8427b81300f73fc.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_21b2078a64534d909073ee1e1c467fe2.pdf?index=true
    • 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_off0000ec08.bin
da8d09460e78f92e318bc265b8fc35ffb71d1591ebc2dbb10e18453b957fc93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 5088 bytes
font_01_sfnt_off0000fd37.bin
be0ac7ddf96df0f3546266b98b009531bbb172c961b372a9d1ba4b12e84dbcd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 11464 bytes

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