Malicious PDF — malware analysis report

Static analysis result for SHA-256 332160bfbeceda68…

MALICIOUS

PDF

94.6 KB Created: 2021-03-17 01:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8ac6e98edd8690cd08a108fc49208394 SHA-1: d842f4c63954533dc33447e1577792ff642cc62d SHA-256: 332160bfbeceda68fffa7f8968d1bc9eb47bdd61d31a2792c4be8bdddc53b75b
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 point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to product manuals, designed to trick users into clicking malicious links.

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://kuzutuzo.ru/award?keyword=samsung+galaxy+s10+owners+manual+pdf PDF link annotation
    • http://redirerer.medianewsonline.com/accidente_nuclear_de_chernobyl_causas_y_consecuencias.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/dreams_from_my_father_book.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/how_many_chapters_are_in_chronicle_of_a_death_foretold.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5ff02e29b4656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493916/normal_5ff184ea1ab79.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/sogasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_60472039c84d8.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/remixasomupidabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/gramatica_a_demonstrative_adjectives_and_pronouns_answers.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/bluetooth_for_pc_windows_10_apk.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_e67c5fb3b5894a9fa9a950c1db43fe0b.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_2817ed5d3ffc47c7b9344e3747c9b34a.pdf?index=trueIn PDF document text
    • http://zesixebejifoz.epizy.com/gajinupedelexuliwan.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/how_to_cook_a_pork_roast_in_an_oil-less_fryer.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_9c41f997ca0949f99b50441bb70007a5.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_c7aed779b3c5422690cbef4ca227bb25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/latest_chrome_browser_for_pc.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_off0001337f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 5920 bytes
SHA-256: 9316857da6cc55295898ff5f4bc12f8539f56e8e0e02eb1c2e5f8667a42bca5a
font_01_sfnt_off000147ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AC 10868 bytes
SHA-256: d6685b9b0af50a109ac8aab2d16ba0334f19613a76d1c2a037e56daa416634e4

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