Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7d05ce565bb397…

MALICIOUS

PDF

74.8 KB Created: 2021-03-25 00:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 064655dc12cf6a490a828c29f157869d SHA-1: 5d6afbf8de1c26cc79eeea706bf266b2859e1154 SHA-256: ae7d05ce565bb397c4adb846702746debb27666ca0d3e402fda4321fbb0c6974
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a probable attempt to redirect users to malicious content or for SEO manipulation. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://botokaw.ru/wix?keyword=rugby+15+trophy+guide PDF link annotation
    • http://nesobaka9.xyz/371734346544ks2.pdfIn PDF document text
    • http://femesugubu.iblogger.org/associer_2_fichier_en_1.pdfIn PDF document text
    • http://nepifenimet.iblogger.org/2086975113.pdfIn PDF document text
    • http://beliyden.xyz/34731064916j9ljb.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/ieAPheZ/47687438296.pdfIn PDF document text
    • http://jatudoz.getenjoyment.net/vexazetoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirerom/fgeicib/power_rangers_legacy_wars_mod_apk_happymod.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/wumasebajimirugebekaku.pdfIn PDF document text
    • http://woxemezamuj.iblogger.org/what_the_holy_bible_says_about_tattoos.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/noVS5ih/86196231672.pdfIn PDF document text
    • http://hurleyshamburgers.com/divinity_original_sin_2_necrofirehtqop.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/best_exercise_program_for_40_year_old_woman.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://choosenews.space/652370126416fmbe.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/cjgiglB/13596471790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_42953d244b634f6098c92d27b8bc45b1.pdf?index=trueIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/braunwald_cardiology.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_5f83437579694b228748e55adb5d65ed.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_cba259d0b5c44853ba42bb5c79e0fdf7.pdf?index=trueIn PDF document text
    • http://sugebajofurite.rf.gd/turekikatarokesu.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_ce6098d33eff442781f9137999429980.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_b7d9876514324467bc9934391be4893d.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_9b1fdd3939d94a79a021305f777252a0.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_70fce1a9b92a43f6a415640845fc0d35.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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 5224 bytes
SHA-256: 5418eb1a4e8ce3113c325c2237ca9fea352b451a36d6f97328ce0aad17a7b241
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10496 bytes
SHA-256: 9affca463ae8664b9082b920f8f2371301e6e7e8c90917cfabd664ecf7c8a613

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