Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b90d2c620f28a0…

MALICIOUS

PDF

71.9 KB Created: 2021-02-11 15:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1b085080f7914f964de3e1be12ccd650 SHA-1: eacff435ca544ffd67b052a5036f6578e08adcd1 SHA-256: 76b90d2c620f28a0ebd77829e3d15e8bc0b37552ab4daf233b32cbdd9ffde20a
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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/wb?keyword=creative%20market%20fonts In PDF document text
    • http://dihtyar.online/education_board_2019_marksheetltr6a.pdfIn PDF document text
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/fb62e933cc3a55.pdfIn PDF document text
    • http://spain50off.info/what_is_the_difference_between_gantt_chart_and_critical_path_methodbdkxu.pdfIn PDF document text
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/mobuleda-tugolu-vedazafisun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_601badece53ca.pdfIn PDF document text
    • https://jevomijaled.weebly.com/uploads/1/3/1/8/131856338/roveviguzarepef_fajisixug.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/xuwuguv.pdfIn PDF document text
    • http://hydra.moscow/97550970605yz5qj.pdfIn PDF document text
    • http://potenciy.xyz/16784000883jvkm4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_601b1e4d0d774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikuputo.epizy.com/23507824679.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/zoxawisuno.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/kotor_2_jedi_companions_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/davatetemafafefonufoper.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/73416133972.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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 4912 bytes
SHA-256: 01bd84b80d84f3f7dc34b7b91683baabe647265694bde3d23ab6f5d35ff8d0c0
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10612 bytes
SHA-256: 3b861abca38e4d0bdd044d9c0054298e73855e27bd3c21f24b9857e732e7ce23