Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb59adcedabffed…

MALICIOUS

PDF

79.4 KB Created: 2021-05-02 15:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d146839cc6b570a825e9d53d8f99be7 SHA-1: c21999665627e9539836911426f5c9a862b16fce SHA-256: dfb59adcedabffed5da7d10467976351f535b33eb16180bc780df8f52ed8d8bc
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized URLs designed to redirect users. The primary redirector URL is `https://druttle.ru/strik?utm_term=how+to+repair+kenmore+refrigerator+ice+maker`, which is part of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF, indicating a high likelihood of malicious intent. No scripts were extracted, but the structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=how+to+repair+kenmore+refrigerator+ice+maker PDF link annotation
    • http://jizerigozigalav.getenjoyment.net/riwerugef.pdfIn PDF document text
    • https://sigegasolo.weebly.com/uploads/1/3/4/7/134732441/1577387.pdfIn PDF document text
    • http://pezozolagipiv.22web.org/rufofaduwowaweso.pdfIn PDF document text
    • http://juzawuz.iblogger.org/top_10_cinematography_books.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/xepisa_dewazokabew.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/91518168275.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/c7e0397.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/business_management_books_for_students.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/37904390440.pdfIn PDF document text
    • http://popuboloza.22web.org/endocarditis_acc_aha_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wagimesitip.epizy.com/22934276074.pdfIn PDF document text
    • http://kimovene.epizy.com/kejadixelemobefe.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/4961648870.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/ingenuity_bedside_bassinet_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/81837768151.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/pererafojixubugevokum.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/tolipidafovoxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/whatsapp_status_video_2019_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/icewind_dale_trilogy_free_ebook_download.pdfIn PDF document text
    • http://lodexizizaki.rf.gd/changes_to_federal_rule_of_civil_procedure_30b6.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/43735695740.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/husky_silent_air_compressor_20_gallon.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_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 5240 bytes
SHA-256: f875efaa52294ca954d0447c1787f98d521f205e597333c9fc567f9a70986d14
font_01_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 11436 bytes
SHA-256: 26e62e431dc6e013a677e76b62033027af204730cc3e4a0373d2b07e96a1359d

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