Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cfe1d7b41ca138…

MALICIOUS

PDF

85.1 KB Created: 2021-03-28 23:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000c78aef76e077668d1f12825bb3582 SHA-1: 29cac5bf65b3254abadb019a368216c1dd14e297 SHA-256: a2cfe1d7b41ca138f2eac6bcd8f709d0c4648b7f015ca08cd8e25a7a5b9feec5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host many PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs suggest the primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=oxford+dictionary+download+free+pdf
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/gupeta.pdf
    • http://mudikovarew.mygamesonline.org/945236731.pdf
    • http://trylait.club/the_16_personality_types_test_downloadcr06t.pdf
    • http://scarcebook.com/5474356572243itb.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/bijevamasofim.pdf
    • http://fibiver.mygamesonline.org/35042619291.pdf
    • https://reguzuseja.weebly.com/uploads/1/3/2/6/132695615/6173859.pdf
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/nodod_ximura.pdf
    • http://sevagawos.getenjoyment.net/sijiranovaji.pdf
    • http://prognoz-football.club/hopeless_land_hack_apk_2020nj6to.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/c36fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/650e8cce-d599-46a1-8c56-6deeb03190f6/how_to_make_a_greek_toga_out_of_a_sheet.pdf
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_47a2e00208b84826bd22ea71b3bf6cbd.pdf?index=true
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_05c7bbb3b55c4291b8b17847d6fbbea0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75e1b72a-d60a-42ed-94ac-21e7a1ae5ce2/garmin_gtn_750_trainer_pc.pdf
    • http://wugerubuvugox.myartsonline.com/74082323072.pdf
    • https://uploads.strikinglycdn.com/files/e6bef986-0d67-483b-904f-ad0c88d332f9/cochrane_asset_pricing_amazon.pdf
    • https://uploads.strikinglycdn.com/files/59267f40-6b25-4065-aa19-5cdd200d7138/sharkbite_3_4_in._tankless_water_heater_valves_installation_kit-25374.pdf
    • https://uploads.strikinglycdn.com/files/b16610d9-5908-4da8-bd79-b1cc39d85ebd/17815682334.pdf
    • https://uploads.strikinglycdn.com/files/6ae65a83-8dc4-4107-8e95-6ce3275b0929/kimivuxejorutovokubajofa.pdf
    • https://uploads.strikinglycdn.com/files/163f8bd9-82ed-4415-b7de-28aec774f71d/night_clubs_in_atlanta_ga_30_and_up.pdf
    • https://uploads.strikinglycdn.com/files/7a60223a-8eb2-4c9d-8f4f-f72037e8a08c/what_are_the_good_research_topics.pdf
    • https://uploads.strikinglycdn.com/files/7c9f0a9b-6770-4df9-ad85-f0c329520c85/hp_photosmart_d110_printer_cartridge_problem.pdf
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_375c16d69af84156b56d4e9bfd415e0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ff30bd3-921d-4f33-a913-2dd886bd0542/91321364276.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f890.bin
401c65110278ce3f724671600b0124ec640fd04a710b87ceac14f593e2acc738		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 5260 bytes
font_01_sfnt_off00010aa2.bin
9e2ab267c53645630b603f7e2247edc66d095f9fdfc3b7f16e5c7b5c6e1f7df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10792 bytes
font_02_sfnt_off00012f85.bin
69e9da043e5af9456dd4ae0e639303bebd5f13b05a6c1ee2518c595973fc913b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 16544 bytes

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