Malicious PDF — malware analysis report

Static analysis result for SHA-256 a126c70cbce1280e…

MALICIOUS

PDF

93.1 KB Created: 2021-03-22 22:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9a656792cf097663cdc3d74a9e4cf313 SHA-1: e15683bec0e0d508a7146addedfb8871ed787377 SHA-256: a126c70cbce1280e820392e4cb008cdcb509c78984a045505285bb442964d037
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. The 'SE_PAYMENT_REDIRECT_LURE' heuristic suggests the content aims to trick users into believing there are new payment instructions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://xezojetit.ru/123?utm_term=adskip+apk+for+android PDF link annotation
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/1906967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5ff65391ccb9f.pdfIn PDF document text
    • https://mugunerer.weebly.com/uploads/1/3/4/4/134479547/gonikumanujigupa.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/remove_watermark_foxit_editor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5fd8694ec8f62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_602e038555657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_60466fdb1a977.pdfIn PDF document text
    • https://vikaworapelesob.weebly.com/uploads/1/3/4/7/134702945/408dc52a7.pdfIn PDF document text
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/5967334.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/jizidifojam-mobupekezelib-romumone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fff0d48b0d4f.pdfIn PDF document text
    • https://jiraxoxaxizare.weebly.com/uploads/1/3/4/0/134012395/346336.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/rural_depopulation_in_south_africa.pdfIn PDF document text
    • https://lobubizewi.weebly.com/uploads/1/3/1/8/131856209/d9c29a9528b85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://nafabumawo.rf.gd/fogidoparimomukugejo.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/90855060712.pdfIn PDF document text
    • http://lovenewaw.rf.gd/30989935649.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/vupiwo.pdfIn PDF document text
    • http://fipivolakiwupod.rf.gd/how_to_check_cylinder_volume.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/sibelius_keyboard_shortcuts_laptop.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/59534457070.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/guide_to_intermittent_fasting_dr_fung.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/wefedizafavovakujak.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/62722480847.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.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 5204 bytes
SHA-256: 7c9080baf544531c383c54c1900a423ef372baeec8effc7a96dcf7e741208694
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 5056 bytes
SHA-256: 6d36b2afc101799d20b81150d84fca19da87f0cee8633725d5088679af6fc2e0
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 3024 bytes
SHA-256: f271277bc92c8ec255f016eb89af31946ace6cee13b85d2ca72bafc089855a25
font_03_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 11284 bytes
SHA-256: dd925c941593ea6018f42d71c515371159c42d20ad77d7e50d5b8bcd43e063d6
font_04_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 11288 bytes
SHA-256: 439bee8d30627f31eb5b8c394f34b6a8b536d47468f1cd6ef82d97013b507bd0

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