Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af6f41072461bb…

MALICIOUS

PDF

555.0 KB Created: 2021-04-15 22:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e911cfb36ab66f28691668ace973da21 SHA-1: 788c4527a7eeee14941b30a1910b27286d63daf7 SHA-256: 66af6f41072461bb272e5f90327d67280fa8184ada7b6ca9737826c39a61f711
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'adaptive behavior skills' to entice clicks on the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8786

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://xezojetit.ru/strik?utm_term=adaptive+behavior+skills
    • https://dixuxizexejo.weebly.com/uploads/1/3/0/7/130740209/b32eb13d.pdf
    • http://maykistore.ru/download_game_virus_war_mod_apk3b8x1.pdf
    • https://cdn-cms.f-static.net/uploads/4386092/normal_60619a5c79d0c.pdf
    • https://bipawekiramobaz.weebly.com/uploads/1/3/5/3/135325031/renufijereris.pdf
    • http://newberginvestmentproperty.com/23828422132eers5.pdf
    • http://leyloften.online/how_to_do_fractions_on_a_casio_fx_260_solar_calculatorl5n0u.pdf
    • http://tur8osale.site/rekox2vtz7.pdf
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/lesanodagik-xapip.pdf
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/4249918.pdf
    • http://smartcreditcheck.info/6029664670167bjh.pdf
    • https://cdn-cms.f-static.net/uploads/4489740/normal_601920e41a3f5.pdf
    • https://dinamulu.weebly.com/uploads/1/3/1/6/131637284/c002b8.pdf
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6042e05934ce3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://13dbc848-c95e-4197-a439-3ae2050b6ee2.filesusr.com/ugd/46bbe5_a2a7b58802f34a0d8a7c3322532a8d2f.pdf?index=true
    • http://nedizilunok.myartsonline.com/89903197121.pdf
    • http://zutaturusix.myartsonline.com/where_did_the_bible_really_come_from.pdf
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_87b143d8749549ebb9978ff6cd30b0aa.pdf?index=true
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_6ea4e0c073a04b0ab8bd3690183fbfde.pdf?index=true
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_923cce75b9f8474bb4ca53e18d23e3c5.pdf?index=true
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_d7392919f4e4446f925afed6b680169e.pdf?index=true
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_bbc449c4397e4c16b55094bd330fc7dd.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_abfb549eb9f24cc7a27d0401cfac012e.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_off00085d76.bin
7f54d35514ac509f8958856c4b3258dfe7bb4547a6c7fabdd03adc096abe0e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D76 5300 bytes
font_01_sfnt_off00086f6e.bin
3d6997768d16749d875c7e82456e7d858d629189ac60d2a4e34ed3b8a3319c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F6E 13056 bytes

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