Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85e93e63497d19a…

MALICIOUS

PDF

79.0 KB Created: 2021-02-22 17:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1c307cb193d1c288c5cd4262420f0694 SHA-1: b7ca9e917e9bc294b800efbef390cf7aadce9995 SHA-256: c85e93e63497d19a2100ff98376b8e73c4421983fa3b955a32394f9b7764f8a8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to a search query, directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=what+does+swabis+mean+in+writing PDF link annotation
    • http://ogranicbio.space/908006429477ig8z.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/5618229.pdfIn PDF document text
    • http://instas.site/wakifarufixazovoxotcvwfk.pdfIn PDF document text
    • http://guwajokuxo.22web.org/kyrie_eleison_chant_sheet_music.pdfIn PDF document text
    • https://zisovubuzuteb.weebly.com/uploads/1/3/6/0/136086112/soxifoguzem.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/4375fc4fddd2704.pdfIn PDF document text
    • http://maddot.space/jajarezargu5cn.pdfIn PDF document text
    • http://copyrighytsupport.com/convert_rar_file_to_freecd3r5.pdfIn PDF document text
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/vijoreven-wunuxusudi-zanosijemen-doligunixiki.pdfIn PDF document text
    • http://tehnotop.site/young_thug_mp3_downloadi651k.pdfIn PDF document text
    • http://mamontov-net.cc/problemas_de_cinematicavaaq8.pdfIn PDF document text
    • http://zinusefubowewet.22web.org/36363809872.pdfIn PDF document text
    • http://vapurese.22web.org/41159883233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bedegotix.epizy.com/61518968018.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/25246765242.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/lefekodagupowaxexoj.pdfIn PDF document text
    • http://gezojetisab.epizy.com/lg_32lf500b_price.pdfIn PDF document text
    • http://daremafuxabo.rf.gd/sinogemolizox.pdfIn PDF document text
    • http://wulekugigewipo.epizy.com/87860107175.pdfIn PDF document text
    • http://gisatazab.rf.gd/cvcc_words_worksheets_free.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_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 5452 bytes
SHA-256: f632cc7a2aa42261a141a9a164b255ef0bff9a77ce3d88e916f95801f84d8339
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10200 bytes
SHA-256: e4e575ee401281f57593fcefd005beccf31f36fa8762cc930f4045d87abc026b

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