Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf39b5909b8cec…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 17:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69e98f5a118d50ae700ba51581ebefa0 SHA-1: c23c6746a309b1a54d49b91036fbf4d9f74fe270 SHA-256: 8bcf39b5909b8cec92977d08ffc41d0533c658e352a4312f76f821daf89868b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of many external links, including one to 'mezovuduw.ru', points towards an effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=cell+membrane+and+transport+graphic+worksheet
    • https://cdn-cms.f-static.net/uploads/4391649/normal_601ccea262fe8.pdf
    • https://cdn.sqhk.co/kegufamop/2bwKigW/drum_kit_for_sale_in_cebu.pdf
    • http://dovulup.iblogger.org/billiards_game_free_for_android.pdf
    • https://cdn.sqhk.co/tuturuno/ahgieaw/w3schools_php_functions.pdf
    • https://static.s123-cdn-static.com/uploads/4417818/normal_5ff9b235ec922.pdf
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fd375fce3b15.pdf
    • https://cdn.sqhk.co/vewukiziwemi/cagcggG/french_english_dictionary_offline_apk_download.pdf
    • https://cdn.sqhk.co/motanunika/idL2KEv/contact_lenses_halloween_canada.pdf
    • http://keferadewurilej.22web.org/35885248605.pdf
    • https://cdn.sqhk.co/dikozogub/jjA68jb/guess_the_famous_face_quiz_printable.pdf
    • http://vulezojemitowo.22web.org/92218968603.pdf
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5fe08ec4bb2f4.pdf
    • https://cdn.sqhk.co/gefimiwotux/pjjDhm5/siragoduwovuvuforibatel.pdf
    • https://cdn.sqhk.co/dinigivo/lGjbqz3/download_game_beat_racer_mod.pdf
    • https://cdn.sqhk.co/labojime/hcO5SRZ/tusuxoser.pdf
    • https://cdn.sqhk.co/xugiwatokax/agdhcZb/quiz_maker_software.pdf
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6026948961743.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_3046948309cc44c094f4fc9b84b6db5a.pdf?index=true
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_fe1c45d202ac4199a2941bdc4ed87a0f.pdf?index=true
    • http://monulaw.epizy.com/69847082689.pdf
    • http://luzowotobor.rf.gd/kixabukomulojo.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_baa93518db334bd3ae5e4fd5644507d7.pdf?index=true
    • http://rupaxabo.rf.gd/royal_sovereign_portable_air_conditioner_reviews.pdf
    • http://zepurudevivo.rf.gd/xoxuze.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_e8301a5cb8bd4658b8d801c2bc0105fa.pdf?index=true
    • http://kipijitifexus.epizy.com/59295681997.pdf
    • http://pubamuv.epizy.com/beer_lambert_law.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_315acb30dfae4018be38c4d7bd181a7e.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_off0000e8c0.bin
bea67d3f5be5dbd1b4496241732ab043ad1b7fc53f24c9c467ea8d83fd3d7961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 5688 bytes
font_01_sfnt_off0000fbf3.bin
a3c92e2ff5bf932ecec2b07c2d41250ef0506223708989be48af1346bc5fbfcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 10820 bytes

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