Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bd625cd092d18a…

MALICIOUS

PDF

76.8 KB Created: 2021-03-16 21:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4129aafe7bce1a0fef91fe3ffe62740b SHA-1: 4984f4d9c2e9fa864d12c37d9870b08696d5fa33 SHA-256: 91bd625cd092d18add83278f7b3934870fd45398eb54e12d493178ff6d7c6f45
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://vilenefex.ru/wix?keyword=mcgraw+hill+my+math+grade+2+volume+2+answer+key` is likely part of a lure to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=mcgraw+hill+my+math+grade+2+volume+2+answer+key PDF link annotation
    • http://maddot.space/45380548391cvy6o.pdfIn PDF document text
    • http://virona.org/fupozegulobulikavu2b98p.pdfIn PDF document text
    • http://nout-prokat.website/toxebefuxafaci2k.pdfIn PDF document text
    • http://ourfanz.com/sed_and_awk_booklak7n.pdfIn PDF document text
    • http://ver-alex.website/dometic_multi_zone_thermostat_reset2cmp5.pdfIn PDF document text
    • http://disconto50.info/iomega_storcenter_ix4_200d_nas_server_manualsttqu.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/48143806958.pdfIn PDF document text
    • http://geesecam.com/beyond_the_walls_full_movie9271z.pdfIn PDF document text
    • http://ulekschool.online/report_bot_csgo_workingsufs6.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/hmdx_jam_speaker_instructions.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/ruud_pacemaker_electric_water_heater_manual.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/85832639179.pdfIn PDF document text
    • http://afracheat3.xyz/27975401411eldev.pdfIn PDF document text
    • http://blue-tick-central.com/55489554668js5i1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipomazuwasa.epizy.com/mimukavoguwoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/attu_film_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/fezubopogevepininurod.pdfIn PDF document text
    • http://girofili.myartsonline.com/the_way_we_live_now_susan_sontag.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/edmonton_movie_guide_cineplex.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/carter_tv_show_episode_guide.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/perspectiva_isometrica_dibujo_tecnico.pdfIn PDF document text
    • http://rututovabin.rf.gd/74734770254.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 5808 bytes
SHA-256: a680dad7fecbeb2681e27aaca0f2e9740eebb49c03f966375aacc9b4948997f6
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 11036 bytes
SHA-256: 0018674a5f9a36c86633c22b746a9e3394255759eacd515c32078d6ba783a3c0

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