Malicious PDF — malware analysis report

Static analysis result for SHA-256 16953cfee5aaa47b…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 19:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 537b752240fdd8dcd2d6e62e0f821e6c SHA-1: 564d4f1edd16b4e6b69b4af7422b0041bce5c4b1 SHA-256: 16953cfee5aaa47b9309c2db0b38325ca8073f2df82a175cc9c0187e60dece31
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=sons+and+lovers+summary+in+urdu PDF link annotation
    • http://lalomazufoza.iblogger.org/68266586359.pdfIn PDF document text
    • http://rat-red.space/2012_toyota_camry_maintenance_reseti9uv3.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/94777745009.pdfIn PDF document text
    • http://puzososiv.22web.org/55329272249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff0a28eba144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_603503fee404e.pdfIn PDF document text
    • http://zespodsvetkoy.site/happy_new_year_song_video_2019ssgla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_601db3069593a.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/ancient_hebrew_bible_dictionary.pdfIn PDF document text
    • http://egrn-order.online/how_to_eat_fried_worms_book_themeq1n39.pdfIn PDF document text
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/zudamijali-nuraj-setofoba.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/hp_printer_6500_ink_cartridge.pdfIn PDF document text
    • http://betixisu.22web.org/cyber_hunter_mod_apk_android_1.pdfIn PDF document text
    • http://fuluvil.iblogger.org/latit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novosumagib.epizy.com/64972197635.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/is_alex_rider_on_netflix.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/57792484166.pdfIn PDF document text
    • http://disoluje.myartsonline.com/apple_ipod_6th_generation_user_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5236 bytes
SHA-256: 76a96f8568becb3ed6f1feda41da8a36d42f0d53caef11f500719171af0a1af1
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 10244 bytes
SHA-256: 0af44df35a355123cb5bed6f51d27e9e092507396c7c2580e7c7220693da5919

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