Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89bdfa24175da05…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 13:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b02cc9a72a6aa4f230a078262cb37cc5 SHA-1: 18fd5c4a9b6eb32f10f1aebb66c0285eb78efa7c SHA-256: f89bdfa24175da05febe90a0314266c757e1b704a8887ef54de82f71bf20547f
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://bologen.ru/123?utm_term=sample+inventory+stock+status+report PDF link annotation
    • http://risonubokedoxav.scienceontheweb.net/waremaweke.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/TgjfB9B/toronuwopebud.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/free_t-_shirt_design_mockup_templatesix3im.pdfIn PDF document text
    • http://all-system7.work/19680077342bkdc0.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/527c2619.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/1tijjiY/slime_simulator_online_unblocked.pdfIn PDF document text
    • http://urolog.xyz/free_esl_worksheets_modal_verbs610co.pdfIn PDF document text
    • https://zufodivovogopot.weebly.com/uploads/1/3/1/3/131383523/tibefijugafoza.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/05a71e6.pdfIn PDF document text
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/limiku.pdfIn PDF document text
    • http://insta-sale.site/2006_dodge_stratus_battery_light_came_on1rhig.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/67574899769.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jhxQRzn/fanikolapebavurajobunoj.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/how_long_does_the_keratin_complex_smoothing_treatment_last.pdfIn PDF document text
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/sofalibinerez.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/a79fa285-d9d3-4ba6-a9dd-80535bc672a4/54954286174.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_4cbfbbd5a16540e99ebe1ffbdca539d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b148f6-20fd-4111-ab9a-4fb56700b7df/administering_meds_via_g_tube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f960719-e885-46e7-8cc7-5200c971de63/noketinokebabikatepegenis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb48667-45af-4158-a8ef-828b601e764a/is_strawberry_flavoured_milk_healthy.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_de7d7d9e60604229aa8c8c8aaa7f7f6d.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_63b401694fe343acb2de0d1c3a99c7db.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5408 bytes
SHA-256: 73f8cabd2eee99959b7a1503d232a5908196ae7a82fbf307192b4e93c1609e6a
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 11080 bytes
SHA-256: 69ef620192d07bddf3d439f07b412e0148775afb51ad6e7c04d9f3d815bf5f80