Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef940f9a0ca25e6…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 11:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b7141fb35c7ab1cdff8e24cb37b3707 SHA-1: 779f6562b5fd2798e02f15152e8593a39f68ae41 SHA-256: eef940f9a0ca25e6d842cfe3a81892dabec2070910dc9bf13e439b56bf20da35
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, a common technique for SEO manipulation or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users to potentially harmful websites.

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://botokaw.ru/strik?utm_term=what+artificial+neural+network
    • http://kifigopetufoge.iblogger.org/rixafitomuwumozeruv.pdf
    • http://yachts-4-sale.com/pixar_short_films_collection_volumeqh8e9.pdf
    • http://lojapidabud.mypressonline.com/ponejulegepikesuwofejaw.pdf
    • http://fallofelin.online/what_food_is_good_for_gerdnz3bx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vebefabose.epizy.com/what_does_the_bible_say_about_sharing.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_165e2c458d9648dabddc10849e66c5e8.pdf?index=true
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_241b1dfb6398415cb94e442c9730f4d2.pdf?index=true
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_c1f40fcaff3945b796896cf4eaede745.pdf?index=true
    • http://wupafar.rf.gd/35704739448.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/south_movie_480p.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_775bf375b0d34a2abec362c7854efe65.pdf?index=true
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_4150844729a944ecbaa5e683be01e9d7.pdf?index=true
    • http://zekezixurul.onlinewebshop.net/seerluga_afaan_oromoo.pdf
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_baed5e586c934b328d69496fdbe8370d.pdf?index=true
    • https://s3.amazonaws.com/sojuravewi/53492702574.pdf
    • http://taterawi.rf.gd/blank_bingo_sheet.pdf
    • http://suwepedufaresi.epizy.com/candy_crush_soda_windows_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecac.bin
9f32399b180aa628a8c9988b415c9c94d7e714a28d03e0b623e6f0c284e464e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 4840 bytes
font_01_sfnt_off0000fd2f.bin
25df0df8c698392db0c0e80a10754ee61a3ae0e4c08b4061b9873457977a444d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10600 bytes
font_02_sfnt_off00012138.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 4324 bytes

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