Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bac959a2c64d0f7…

MALICIOUS

PDF

73.1 KB Created: 2021-01-22 17:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 504d017fbc4b7c18af8d7734a9c7c044 SHA-1: d5b83345f26ab98435a174f2f7af03c7c0ab6686 SHA-256: 0bac959a2c64d0f7b1762edad52068b190a852a67d225a098356313c5f8a3099
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=reading+samples+with+answers In PDF document text
    • http://xonibiz.22web.org/antivirus_android_gratis_avira.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/veninewi.pdfIn PDF document text
    • http://wigomufeze.22web.org/conceptos_basicos_de_epidemiologia_veterinaria.pdfIn PDF document text
    • http://gifozuxozud.22web.org/25074833875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5ff9f9403f668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/archaeology_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/vupitetevuruxu.pdfIn PDF document text
    • http://tufukupetateto.epizy.com/83013482620.pdfIn PDF document text
    • http://relilirijupike.epizy.com/90991517042.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/zivirurozorubavirel.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/nirovivexupa.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/counter_strike_source_v34_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/17771461255.pdfIn PDF document text
    • http://beverotunege.epizy.com/heat_transfer_worksheet_doc.pdfIn PDF document text
    • http://legatuwaw.epizy.com/tukeforezodetaminonad.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_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 5472 bytes
SHA-256: de819f894ef205edf57da14bf9374a87fcdfa65d535c1a047e000775a7a19e25
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 10356 bytes
SHA-256: 9dcdcda25552b05bf4e094f7fbea643c22e4e5a40e12a8aeb8f9b2aa993af10c