Malicious PDF — malware analysis report

Static analysis result for SHA-256 9866fc593d7a728b…

MALICIOUS

PDF

80.6 KB Created: 2021-04-04 08:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eddc9cfe9eeb50419f0c64be71af60f SHA-1: af88575646a4ff8db9b4400b0557c7752528cf56 SHA-256: 9866fc593d7a728bb8997fa5774b510001a56e757c9e2eb2acffe1b922b4d752
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/123?utm_term=spanish+ser+and+estar+worksheet+pdf
    • http://tramlaweq.online/104988852860cgjt.pdf
    • http://dojemop.mywebcommunity.org/15909065531.pdf
    • http://tdsevsvet.ru/semi_monthly_payroll_calendar_templateqhszf.pdf
    • http://farvestnn.ru/1412068619f5yfa.pdf
    • http://zuvatewovu.scienceontheweb.net/ansi_150_rf_flange_dimensions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zakivijojinikij.epizy.com/can_bus_shield_datasheet.pdf
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_fda23cc10f67451e9eb6c0e25e9451b5.pdf?index=true
    • http://fulisawuxulinis.rf.gd/free_abstract_reasoning_test_with_answers.pdf
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_4c2539fb3dfd496b966ffd8948ca1dc6.pdf?index=true
    • http://kobuxotaregudes.rf.gd/giradeledafimoviwodofa.pdf
    • http://xevorerokune.epizy.com/cidade_maravilhosa_musica.pdf
    • http://jovigoxuja.epizy.com/65229418010.pdf
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_3c2b06dd60484550b590169210d9c781.pdf?index=true
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_8a8aa7c03ce84b4a895a0d600a99ce6f.pdf?index=true
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_2e4a268d5bc145e296f8a12b511152f1.pdf?index=true
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_1205a8daa3dc4f8eb53dfd0ea89078a8.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_9b20846cc0a14919b538361b90fdb761.pdf?index=true
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_41437c7d810d4362950becd9aef0d739.pdf?index=true
    • https://8f21bb9d-4e2f-43bf-be03-ed42adb9dedf.filesusr.com/ugd/738632_f77197b3241d4951b05ce03e88588bda.pdf?index=true
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_89cca2a9a127469888755c0707ccc9ad.pdf?index=true
    • http://tasukifuputuf.epizy.com/piano_sheet_music_for_beginners_amazing_grace.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed06.bin
0c284c230524ab047cead0cfff7f4a11ea1a5d0049b80ad99e08d6cacb03f52b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 5144 bytes
font_01_sfnt_off0000fe80.bin
20b00d512ae322d9f68c864f62516d81b26aea34ac729a69d02cd49013655d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 12372 bytes
font_02_sfnt_off00012709.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 4324 bytes

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