Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bb208d2a3fb393…

MALICIOUS

PDF

89.5 KB Created: 2021-03-19 17:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 75c69e0f1d7768fcb861b913988ffee2 SHA-1: 562a5d968d6d26dea529787557c53b8b8a948750 SHA-256: e8bb208d2a3fb39342bf04d1419d48e31120312229df831bce69a603102f0189
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=generation+of+sinusoidal+waveform+theory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601b8de787cd6.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/99720718449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_602fcded5a336.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/23567857121.pdfIn PDF document text
    • http://pewodebepefawi.scienceontheweb.net/21237028320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_601d9d8b2b5af.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/41988269747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc87b69cfe9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_600a038831d28.pdfIn PDF document text
    • http://zedateve.mypressonline.com/bejizeluwawinijeviginikos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_602a35ca6376f.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/cfa_level_1_derivatives_and_alternative_investments.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/yasin_tahlil_dan_doa_ziarah_kubur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_603003015db2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5fe9ac3c64acc.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/what_is_gothic_art_characteristics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6496dce2-b0f2-4830-aabe-3ae458a05318/excalibur_car_alarm_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d416f4-e7cf-4478-8178-dd8fa5619f2c/fodikufavuxigikudadeg.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/best_markup_app_ipad_pro.pdfIn PDF document text
    • http://tokozod.myartsonline.com/berg_balance_scale_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a73a89-453f-4b35-b92c-d140089da059/kindle_fire_hd_7_case_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b35a1b-1169-4d49-a758-1f68db74fd65/86552300258.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 2972 bytes
SHA-256: 0bf9469f6cbf64c0badb18945d2c2eb4c7a4e472e7aacda42aec409c4e2fe86d
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 5316 bytes
SHA-256: 31f62a8fbbefa6435d21abfa60ca5c5a51156df53e51dc07d2f5c4421d8c1118
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 11388 bytes
SHA-256: 359631330f1f4dd1d7bf2cd4020cdc905796245389d866ba9429380948dea846
font_03_sfnt_off0001332c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332C 16332 bytes
SHA-256: 9fcacd839c683e00c82b99fd24cbaebdf928170336b8232df7e382ee4c73d31f
font_04_sfnt_off0001490a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361