Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bc7733a0cd12aa…

MALICIOUS

PDF

80.6 KB Created: 2021-04-02 03:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 890fb54af9e7fb5257edd14512ed823a SHA-1: 90262ef9fafc722d034a244d6b558c24cbb442b7 SHA-256: 45bc7733a0cd12aa840744cfee1ce35569621f61092b47d662fa46313e70ecce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=which+is+easy+to+learn+php+or+python PDF link annotation
    • https://cdn.sqhk.co/figegixo/hfBagjJ/chestburster_alien_3.pdfIn PDF document text
    • http://kufinajes.iblogger.org/how_much_should_i_charge_for_graphic_design.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/78606878310.pdfIn PDF document text
    • http://bigezidara.mypressonline.com/berliner_platz_1_neu_a1_download.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/geupFha/39196925465.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/everstart_smart_charger_codes_888.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/how_to_remove_clutch_on_homelite_chainsaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jupurutage/hihehi9/rijebiriliwawejerugif.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/bjgETja/xipim.pdfIn PDF document text
    • http://fegebekuxew.22web.org/57579501182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagelenobom.epizy.com/33438285051.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_c7019c4a1dd3402d86a9e3b782abf2ee.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_779afd2d44e549c5b610899188e643aa.pdf?index=trueIn PDF document text
    • http://faxiruvud.myartsonline.com/how_big_is_30_by_40_inches_in_feet.pdfIn PDF document text
    • http://zutibebasonuf.epizy.com/nagazelulotogafokonomam.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/electronics_and_communication_interview_questions.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_4c644089b07b4c788a758f4735155308.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_f3e8c6ba7598413896fd11bd7db91a06.pdf?index=trueIn PDF document text
    • http://jujodixawo.rf.gd/puperapigaxolak.pdfIn PDF document text
    • http://diveruwafulebes.epizy.com/kenasegosenibisasif.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_7e8d6f8ded8a4f3f83643ce1d887bd7e.pdf?index=trueIn PDF document text
    • http://kejefutipetube.epizy.com/lejeduwulazaga.pdfIn PDF document text
    • http://duwewovimafuz.rf.gd/pirates_of_the_caribbean_piano_score.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_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 5136 bytes
SHA-256: a6ea27427df13ac4711f6ca42131870c43fd1b01962e29dd1ae4606947b882c0
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 10772 bytes
SHA-256: 92c28ff5fb88f640c607ed33537251bcdb4e1e06952b596e4abdac8eb70a4f54

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