Malicious PDF — malware analysis report

Static analysis result for SHA-256 4170f04cf47361bb…

MALICIOUS

PDF

95.5 KB Created: 2021-03-27 17:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 142e5564d25a064f0f29e147121c1f0c SHA-1: 8ff76a4f6699e17e73026f581338fa418c913c73 SHA-256: 4170f04cf47361bba1bbc6388dbf1e587e28d15ac6fea69eb00eaea3a1ec4db7
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 0.9995

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://crophysi.ru/award?keyword=ant+colony+optimization+algorithms+pdf PDF link annotation
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/524254.pdfIn PDF document text
    • http://tofoxewesaxizuz.mywebcommunity.org/xurutuniwuwawaboli.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/8914327.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/92958122570.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/12468673286.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/bosadedavirobokufij.pdfIn PDF document text
    • http://retoxen.mypressonline.com/58426212707.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/51833243824.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/puwisuvexul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jezevenakos.myartsonline.com/viwuvajegamodujixigimomap.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/16865522070.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/40526066099.pdfIn PDF document text
    • http://sadozejeko.myartsonline.com/how_much_does_a_computer_security_analyst_make.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/applied_multivariate_statistical_analysis_6th_edition_free_download.pdfIn PDF document text
    • http://xusapibu.onlinewebshop.net/el_libro_de_abramelin.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_63d5b08f0f6c43088f69d0af10b9afe5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86f0d6e-1232-4e19-9198-ffa68afb24b6/what_is_the_warranty_on_a_badger_garbage_disposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc646bd-9525-45b8-b78b-e9907e6e5286/47000617452.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_66b8f3fe267f456dac1128d9a78faa6c.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_5458cbe1e46b44659e132629f099ae91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91863f9b-ba79-4837-89c0-d40394d8dc41/rex_c100_pid_controller.pdfIn PDF document text
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_79a729799a9b40a097fe3460f1150a5c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D1 5380 bytes
SHA-256: e1cb73aed40f8fbffe5e705b7e10258dc728d9663440444a2082d90d78106965
font_01_sfnt_off000139e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 11828 bytes
SHA-256: 637b224ac096009cea37a36334d9a3d7e7c30bf2dc8e578a17a7051f4c11b2e3
font_02_sfnt_off00016225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16225 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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