Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4ff2596aef1aaf…

MALICIOUS

PDF

72.6 KB Created: 2021-02-13 08:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: dbf19f94bb7a9db9f2549ed596242b7e SHA-1: bb8ea8d6d00692dbe9eea4cd251ad151647e976d SHA-256: 1c4ff2596aef1aaf6ff6605e5a63f38db3eb690e5806d26c311bf748987b8ba3
314 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/89777237.pdf.
  • 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/wix?keyword=dna+mutations+practice+worksheet+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fd3b36c1c22e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5ff612ca89f19.pdfIn PDF document text
    • http://kalavar.xyz/sofakas4bxc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_600605f3d3861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff38b15d3780.pdfIn PDF document text
    • http://gidilixad.66ghz.com/arundhati_song_isaimini.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/89777237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_601e216d0d117.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/new_bhojpuri_video_song_hd_free.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/9773925688f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393363/normal_5fee9bc33252c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fd7ed5f4278b.pdfIn PDF document text
    • http://pomurofame.iblogger.org/fuji_mountain_travel_guide.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/067e689f3ffd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomimuju.rf.gd/creative_cloud_uninstall_tool.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/vmware_administrator_interview_questions_and_answers.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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 5400 bytes
SHA-256: 146dc5aaa91be0379a463244c18dab522610b7d13dfe69d169860ee901d4f3a3
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10500 bytes
SHA-256: 7d4def814f8895d944a7a7f737ad8f288eaa6a8783f0d232fa704ca64c4bb325