Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cba51209f912016…

MALICIOUS

PDF

92.7 KB Created: 2021-04-17 19:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 708e28fe3f67e299fc0b52626ea3885c SHA-1: 1188ec1017a658dcd88737961cff9ee7b8c68384 SHA-256: 7cba51209f912016955075d86920f98796eb858c4c6a25abf151ea6c69f63e75
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=kicker+cvr+12+ported+box+specs In PDF document text
    • http://lenafitokid.iblogger.org/autocad_commands_list.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/MPumgeZ/acrylic_nails_at_home_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ho3XOW7/animal_shelters_near_me_hiring_16_year_olds.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/idibCjf/xixixusojuburuxogonatofiv.pdfIn PDF document text
    • http://tisurejafin.22web.org/prevent_submit_form_js.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusunikumejimet.rf.gd/accountancy_class_12_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0ede60-ad29-4146-a2a6-216825eeb057/69657507477.pdfIn PDF document text
    • http://bajuxatimilema.rf.gd/lafikun.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_5969addfdb0349b6b886aebc928b53d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxiweke/vowipasup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323fb2af-aec6-4922-a479-67e807d1d5f1/signs_of_the_six_trigonometric_functions_in_four_quadrants.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/14547241319.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_194610ea2ce94161ba0452436be400ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/293e6639-0b80-4360-bc6b-8e9ce65e3b0a/vazubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69522de-4a95-4529-8f88-f3164d16b465/troy_bilt_mower_owners_manual.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_fe62621f83a34712a9345e13ff2c1f59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/52121835650.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/adobe_reader_dc_full_msi.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/blackberry_classic_phone_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/how_to_crochet_basic_socks.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_692151dbaba34519bc3f30d637ad6634.pdf?index=trueIn PDF document text
    • http://rikukevez.rf.gd/bioethics_an_anthology_3rd_edition_free.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_6cce9655fae14476b8affba32f2c6de3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd341fa-a036-48b5-a796-1483e3133a82/84072236922.pdfIn PDF document text
    • http://jujobope.atwebpages.com/tufijudi.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/32747412034.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 3088 bytes
SHA-256: 390087c8d82b8a716a1268903a23fefbf1dd92c8b51a4cfcf3ec30d480b8749c
font_01_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 5308 bytes
SHA-256: 84a2ad41e75c5f4f0ae9ea545ac8e135e0e009d1dedf500d136e4b46b8d4f3ff
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 14268 bytes
SHA-256: ec0dd006ebc97cfd1c1373f888c43982cc34df4ca96c8582df5bf33cd8b60c66
font_03_sfnt_off00014ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBD 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501