Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef65ad1e012f751…

MALICIOUS

PDF

98.7 KB Created: 2021-03-18 10:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a34c5849fe5e76dc4bb7d149dd0e02f SHA-1: 9ded39de2e6a2cf8f804a6df60b729572c8f33ca SHA-256: cef65ad1e012f751fdc38996c6e43ca3e495a87f91e13c1d5b583bfeb13469b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links pointing to other PDFs. One of these links, https://lozipotod.ru/award?keyword=allopathic+medicine+list+and+uses+pdf, is flagged as suspicious. The ML classifier and ClamAV also strongly indicate maliciousness, suggesting this PDF is part of a link farm designed to drive traffic or distribute malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://lozipotod.ru/award?keyword=allopathic+medicine+list+and+uses+pdf
    • https://wipevotabekux.weebly.com/uploads/1/3/1/6/131607119/9828282.pdf
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/munuvuxegezokuro.pdf
    • https://cdn.sqhk.co/jivonotiso/exjcibb/los_picapiedras_en_espanol_capitulos_completos_hd.pdf
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/nufoxukadufi.pdf
    • http://nakanilo.club/kevejukoginitepomatefiyq9op.pdf
    • http://inertbhjbj.ru/service_intervals_suzuki_sv650a26x0.pdf
    • http://monoga.space/bimibotamopodanabixesujifixiii.pdf
    • https://cdn.sqhk.co/pinepopowig/gbutsja/xilidimefomokixuz.pdf
    • https://cdn.sqhk.co/gisepavuv/dhchaWW/bmcc_blackboard_for_instructors.pdf
    • https://cdn.sqhk.co/samanugutu/bZ8ZgdZ/ocean_fortune_unlimited_money.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25d86f72-5f7a-45a6-96d2-d7eba68318b5/65652514088.pdf
    • https://uploads.strikinglycdn.com/files/cf328298-9b6e-48d6-9595-5b560ee6a4a1/what_is_the_theme_of_harry_potter_and_the_goblet_of_fire.pdf
    • https://s3.amazonaws.com/mefovu/35479914456.pdf
    • https://uploads.strikinglycdn.com/files/9e61d3d0-ee2b-4d0f-a752-9aa0b0ac9e51/what_is_service_economy_supply_chain.pdf
    • https://uploads.strikinglycdn.com/files/d6d688b7-56d0-4922-bde6-b99dbcb328a8/how_to_invest_in_gta_5_stock_market.pdf
    • https://s3.amazonaws.com/mipizaju/animal_information_in_english.pdf
    • https://s3.amazonaws.com/toguvaju/asphalt_8_airborne_android_to_ios.pdf
    • https://uploads.strikinglycdn.com/files/71e22ad7-600f-4aa7-a610-3001a0353d24/da061l-3d_motherboard_bios.pdf
    • https://uploads.strikinglycdn.com/files/d2659621-2dc7-4a74-b547-27cecf48d593/what_plants_are_unique_to_australia.pdf
    • https://s3.amazonaws.com/gogoxowiniza/lenosepirisuguzutir.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147a3.bin
f0928a70a2cd39aaf3350e73ea949087e52d79a012c40d5a0b82249a0d31b03b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 5288 bytes
font_01_sfnt_off00015980.bin
72de7b583cd1147f9ca59c3e13c77a61e9f39b4a3f524af94304442addaf9a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15980 10472 bytes

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