Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c67f3ac86854f6…

MALICIOUS

PDF

70.7 KB Created: 2021-02-28 20:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: a7f913065bcffa499b6f815c0e98e60b SHA-1: 47a3ee591b5b3a0678899013126a7ef08071eb9e SHA-256: b5c67f3ac86854f67bcb2c3cae8e66bf881b8ac7987746291016aa58233d8bb6
194 Risk Score

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
  • 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://dafemum.ru/award?keyword=facebook+help+center+chat In PDF document text
    • http://midorezif.iblogger.org/samiran_baul_gaan_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_6020b8eba5e43.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/the_diamond_of_darkhold_ending.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5ff1e7b98aa79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_5fe6208c727bd.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/zoxewudunigus/gofegenenivij.pdfIn PDF document text
    • http://xumusuriwo.rf.gd/taco_bell_diablo_sauce_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/zapawifusagozolofel.pdfIn PDF document text
    • http://bevunogigofijag.rf.gd/medicinal_plants_images_and_information.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/xolewirumubom.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/week_days_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/advocare_24_day_challenge_app_android.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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 5004 bytes
SHA-256: 88dea6364aae0642daaa256cfe592501d7c382ed4a63dd0d9c2c5a5d82faa11d
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 10004 bytes
SHA-256: 7ecdce76e10b733d98f2043d4d196b47c4eaf7a30c2ea3bc50e7d6085c7c9ed0