Malicious PDF — malware analysis report

Static analysis result for SHA-256 921d3f22d46e2dd5…

MALICIOUS

PDF

81.9 KB Created: 2021-06-09 04:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b8a52e88fd61c22865eb4c0c972f48fe SHA-1: 5e6f10b5d22e8aa7dd26b33ff0b530e47f8e6834 SHA-256: 921d3f22d46e2dd5e42246c202c50700107457fd92327ee393b7b680677dfacb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://queure.ru/pbw?utm_term=sura+yasin+mp3+free+download PDF link annotation
    • https://xufizigox.weebly.com/uploads/1/3/4/4/134479456/8f5d1b9e97f5e2.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/f70d911e6.pdfIn PDF document text
    • https://somusepuxe.weebly.com/uploads/1/3/1/0/131070447/fokutapenugileg.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/pujeziwiw-keriti-tagikazebu.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/pajegaboxonawus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molosafokaji.pbworks.com/w/file/fetch/144544896/volulowosexaradexizaz.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144678438/como_transferir_musica_iphone_para_iphone.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144843276/pirates_of_the_caribbean_4_full_movie_tamil_dubbed_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b73d868-69c2-4d56-91c6-9d696654677e/wagner_spray_gun_spare_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ac7c4f-3814-4a3e-9134-438dca37bfe3/roxoxezetasemujonivaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ddc9f2-8cec-41e8-bada-1a8e54b076aa/how_much_does_a_medical_laboratory_technician_make_a_year.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/scp_secret_laboratory_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e86b2fd-803a-4093-837e-af2bc2850355/how_to_stand_out_as_a_dental_school_applicant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f38eb40-a671-42d6-b037-42d59b918456/texas_instruments_ti-34_multiview_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c02efb-a721-48d4-a63f-4580e78ffeeb/30567190288.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144868686/41932602253.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn 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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 5648 bytes
SHA-256: e8dd0474b2dfbb79131e2f4793c1761e263d3e26e7dd30f8e32a2f95da1cbf99
font_01_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 8872 bytes
SHA-256: dbed182c0d1830b7e8e98f7eace7acec8b1c3ca76e9b093dd07a34ae078230cd
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 10752 bytes
SHA-256: b8335764168ca6c83d381160b8fd32420d7709288310db8c565d79e570af7a7d
font_03_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16780 bytes
SHA-256: eecd3968d089dda8ad5cc69ddb6dad487148bbf80e39e99f5a4d35f152f2243b