Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e427215da28db04…

MALICIOUS

PDF

86.7 KB Created: 2021-05-27 14:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4090fd8de1b36044e39953694abae5db SHA-1: 82b8957e74991b1ace3e36bde6a527c4a43693dc SHA-256: 2e427215da28db04cb4d227710973aa546fd4b8bebe57f27f77591e128a611d0
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 0.9995

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://jacksth.ru/strik?utm_term=is+overeaters+anonymous+effective PDF link annotation
    • https://rizimajapalikum.weebly.com/uploads/1/3/4/6/134633575/8be7947.pdfIn PDF document text
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/vabupi-nitezibi-vugemir.pdfIn PDF document text
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/9352507.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/womowosi.pdfIn PDF document text
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/vovagevanivik_delafoz_zenepez.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/1f30d9886.pdfIn PDF document text
    • https://mapusuxila.weebly.com/uploads/1/3/7/5/137502154/fopadusezivon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70c24ab-e33b-4ff1-a962-8fe7520d797e/why_wont_my_sewing_machine_back_stitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448763d9-f0ac-4afc-a5e1-2d3b669ddee6/22312059041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f36932-8512-4a90-91bb-6ae31f7a5108/msi_h81m-e33_drivers_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a664cb5-cf3d-4d7c-858f-5dd955317518/literary_devices_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da649204-0886-4074-8a6c-4cc3ff96873d/playstation_vita_buy_new.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8746418b-12c1-4cc0-af35-4735afce7113/retewudiwenakuganesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2c993d-ba44-4f96-9fd5-c9776901cdde/63566139450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2ee3d4-0d82-44a8-a043-03fc4ad47d19/how_do_i_get_batteries_for_my_hearing_aid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4c9cef-ab39-4ce8-9330-e821cd854234/hamilton_beach_rice_cooker_manual_37536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223814ad-714a-4b41-9728-014692184c39/badasus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a4a983-9cae-431b-b9c9-08c35c25dd3c/how_to_troubleshoot_auto_ac_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a410af5-be99-494f-a13e-ec622de45ebe/nivamesub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e546140-5387-4fcd-93c1-41e87f0447ee/is_synchrony_bank_owned_by_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99cf824e-6efb-4cc2-bff2-a5ce451148d4/vifawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6046d64-1b46-4f6d-a9ba-26017ef1bdea/rakojepenonoluwulobew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 5096 bytes
SHA-256: 050d1a640e7c7265f76efc7f15946b226fc0c7e39dcaff6ae81ca3ba705018c3
font_01_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 10804 bytes
SHA-256: 1d7b441e70e75ef158f40a886258acf76edd7cf69d5a5161cff122c25c90e9b9
font_02_sfnt_off0001368e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368E 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd