Malicious PDF — malware analysis report

Static analysis result for SHA-256 c893648f73ba74a0…

MALICIOUS

PDF

66.6 KB Created: 2021-02-14 14:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4e90184aa7a444cce31642b0fb4c2022 SHA-1: a2cf445f581ba6ee3778de7729205c00e6b5c205 SHA-256: c893648f73ba74a07b9f1fd5aca3db8d9025775b9a681d792f00e5e6f98a3c94
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=prefix%20suffix%20worksheet%206th%20grade In PDF document text
    • https://cdn.sqhk.co/moxibusas/eKl6eIc/pipezidobod.pdfIn PDF document text
    • http://repair-foto.ru/arcade_games_all_apk_uptodown9ugjz.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/ahghhgd/bugujeziguretewar.pdfIn PDF document text
    • http://arm-watch1.club/653494470732usg9.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/AFaGhf1/3479276450.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/5hbENjg/stack_overflow_error_c.pdfIn PDF document text
    • http://unityfree.xyz/blood_clot_is_forming_after_tooth_extraction09mhh.pdfIn PDF document text
    • http://lasns.fun/794701441042lukg.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/ijhfJhd/monster_hunter_generations_ultimate_monster_tier_list.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/lowebemuwojiso/89383744737.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/frozen_2_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/17670840210.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/34623443115.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/13418087329.pdfIn PDF document text
    • http://mizebowofaz.epizy.com/xonomovogupixusunodisi.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_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 5516 bytes
SHA-256: cf49af7dbff19fb5d4d9f1894c244f5090e43193b0f5f436534ecb55f467104f
font_01_sfnt_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10632 bytes
SHA-256: 2058dfd91e1daa78db6c5b190eb9715a03a3fe73b3f5ffd19ec8c253d8c665ed