Malicious PDF — malware analysis report

Static analysis result for SHA-256 f492e606bcf0d0a7…

MALICIOUS

PDF

72.9 KB Created: 2021-03-23 05:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8503c8ee76389f830684ef39e3ef29fd SHA-1: 52566ca0f90660e43dcd3fee12b7ab10349a33fa SHA-256: f492e606bcf0d0a7f9ab994497b1d3b9f0cf9d04e21390593abf7331f7fde28d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/123?utm_term=poe+jewel+crafting+guide PDF link annotation
    • http://ygrash.website/lugejupolaputo1ve5f.pdfIn PDF document text
    • http://storeeu.info/bawovawixijrble.pdfIn PDF document text
    • http://tefigizuvixan.22web.org/bet9ja_mobile_app_for_ios.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/cuanto_equivale_100_metros_cuadrados_en_pies.pdfIn PDF document text
    • http://bizbize-yeteriz.org/luwufikaqkkin.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/94096851428.pdfIn PDF document text
    • http://premial.su/wemuxajulufekupewitaxazclww5.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/kejarufogumuru.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/how_to_describe_eyes_poetically.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/79159224215.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/2f6134f1-5ba6-4ac0-b865-6aa5b91d3c19/ge_hydrowave_washer_clean_drain_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f993c0f5-e61b-466e-8b74-6853372a9c97/ligizomizobawovonew.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/biology_textbook_grade_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd37548d-ff2d-4947-ad75-36da1dab810d/the_magic_school_bus_theme_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c84f9e9-0da7-4db1-b093-adea9957a0e6/86908009884.pdfIn PDF document text
    • http://nojupaven.rf.gd/siwilujigixuxulipiwebaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab91a86-71ca-49ad-b6ed-a17c45e1dd1c/bulomipiwusumatixoda.pdfIn PDF document text
    • http://gegetebipa.atwebpages.com/enterprise_risk_management_adalah.pdfIn PDF document text
    • http://pawubiba.epizy.com/28694880225.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/bsc_csit_entrance_result_2020.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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 5180 bytes
SHA-256: d2a75be4615b4ff321904a451710e96853ccf584eaf0b20c5fe161f940ede0f6
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10480 bytes
SHA-256: 496c09e94327251372232191dcae2b914709fef78863f1f8a43ba1a75c5a7cc1

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