Malicious PDF — malware analysis report

Static analysis result for SHA-256 643a3401ef4f6ed1…

MALICIOUS

PDF

96.0 KB Created: 2021-04-12 02:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 862109ad6e3ac91b8ac158df269947dd SHA-1: 550b68457ac810b0acd04ce2daf9f68744c3b814 SHA-256: 643a3401ef4f6ed156352a85be6efe48b9cb520753d1ac0e5f4a5fc3c6f6d5bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://vilenefex.ru/strik?utm_term=what+is+an+artist+statement+and+bio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff7ab0269f10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476446/normal_5feb9c60c69f2.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/pearson_algebra_1_book.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/wedasadasidep.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/61151073916yzc1t.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/dyson_v8_motorhead_cordless_vacuum_reviewssc57n.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/bible_study_tools.pdfIn PDF document text
    • http://nimewolixini.iblogger.org/element_television_customer_service_phone_number.pdfIn PDF document text
    • http://xebupalifu.22web.org/jurnal_abortus_inkomplit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_60333925602ca.pdfIn PDF document text
    • http://twitter-center.com/39103818878zgjg5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ff69675d61e7.pdfIn PDF document text
    • http://risiwivozival.iblogger.org/z_camera_photo_editor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_68ec78646d694a51a1bffcdc7c3796fb.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/walgreens_automatic_wrist_blood_pressure_monitor_reviews.pdfIn PDF document text
    • http://jekoradamotud.epizy.com/beginner_guide_to_drawing_anime.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/how_oxygen_concentrator_works_video.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_d2744333e0674e2d8b64f34945ee9f35.pdf?index=trueIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_eab6b4b4a748467b87666be5441425ab.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_ef3bb2586c0c43f1951eb7d10c0f86a4.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_ff1021655645408cab2505397d6032ec.pdf?index=trueIn 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_off00013790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 5184 bytes
SHA-256: 706366c8d63b1779bf67b05b590f03755f40693d1e6037f2a55da113ac65036b
font_01_sfnt_off0001490b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 11860 bytes
SHA-256: fb970e2f4ada2732d60046810e74418149af66d6ccc855a6375df9892a1eca8d

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