Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a74df667ee2cd3d…

MALICIOUS

PDF

69.5 KB Created: 2021-03-13 16:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eddbb6283e91d90e3ea1b2983d3f507 SHA-1: 88e417d584725d15a37fe26980595925da309b0f SHA-256: 6a74df667ee2cd3dbd27254d3ae78d91b689fbe6d5422974009d5acc54d0e6c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search results for various documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=autocad+manual+2020+pdf
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/kedapijazisega.pdf
    • http://opticsystem.website/892316497205e6fv.pdf
    • https://cdn.sqhk.co/xuxozowaki/hZiggj5/word_trip_level_573.pdf
    • https://cdn.sqhk.co/topazawu/uQjaij9/tokoxamut.pdf
    • https://cdn.sqhk.co/muvotugi/nXgiihb/malodutowolote.pdf
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/1227140.pdf
    • https://cdn.sqhk.co/fagiseregu/ghlYjgv/101_okey_hd_internetsiz_yuzbir_okey_hd.pdf
    • http://teplotronic.ru/sosovab4h7m8.pdf
    • http://muzhskoizhurnal.ru/which_robot_vacuum_cleaner_is_best_for_pet_hair4a7xk.pdf
    • http://talkme-news.info/matematicas_discretas_y_combinatoria_grimaldicyqoe.pdf
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/56dec0.pdf
    • http://rmk4sale.xyz/how_much_is_jim_parsons_worthwc27z.pdf
    • https://cdn.sqhk.co/ketixudolu/cmiffgg/fox_news_live_youtube.pdf
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/9798485.pdf
    • http://hookup157.fun/quotes_from_the_selection_series_with_page_numbers1fpbg.pdf
    • http://dommasters.site/sony_dsc_f828_memory_cardngf8t.pdf
    • https://nurowilalivep.weebly.com/uploads/1/3/1/3/131380447/9647443.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nalelib.rf.gd/metabolism_in_architecture_kurokawa.pdf
    • https://uploads.strikinglycdn.com/files/55c9469c-5855-4cc4-a2ff-827c825a1589/lunofupawuvedusumiditokos.pdf
    • https://uploads.strikinglycdn.com/files/3e1a0e98-8eff-41b5-9d63-9d065b3cf46c/xujeku.pdf
    • http://gotenekopibijo.epizy.com/junab.pdf
    • http://gizolejonig.rf.gd/lipakoxinexikibaw.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_off0000d2fe.bin
55e8fd516b0461c2424ad77d63996cd9964ddfccfc9c388836d89cef80e82822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 5288 bytes
font_01_sfnt_off0000e4f4.bin
714208a0f1ef751c2d555b45580e9fb473fe2b70953938b1dc214804bdd9008c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10548 bytes

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