Malicious PDF — malware analysis report

Static analysis result for SHA-256 f733c4c1031bfec3…

MALICIOUS

PDF

81.4 KB Created: 2021-01-28 05:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: f4c70da043e132a8e05538f6bb57e0d0 SHA-1: 55177a02281dfb57999038ff3b54a6116d4cc6f9 SHA-256: f733c4c1031bfec32816257cc47ff43203da0825355eaf2b32aa37d96477d5c2
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/aws?utm_term=cement+board+sheet+sizes In PDF document text
    • https://cdn.sqhk.co/giganopof/2gHZnUI/munujudutonuradar.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/jafhegd/72934924620.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/SWFijhj/75888063436.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/Hsjdfy0/5402431016.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/tJTzvhi/57909552422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5fe1715febded.pdfIn PDF document text
    • https://cdn.sqhk.co/najuvotuwoz/mDVjbFV/mcdonald_s_near_me_open_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/mgdgdnD/non_disclosure_agreement_download.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/tawosutosuxi/avast_secure_vpn_license_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/nofekufiwu.pdfIn PDF document text
    • http://zovaner.rf.gd/donurivajafulezowetix.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/baixar_jogos_para_o_ppsspp_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/aperture_priority_vs_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/reading_comprehension_worksheets_b1.pdfIn PDF document text
    • http://xaxidos.epizy.com/74808316544.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_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 5128 bytes
SHA-256: 85baef50b1e001d646b51a26b20c26d9ee3fb1c14d7f19238fff03265dd5304a
font_01_sfnt_off00011238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 12560 bytes
SHA-256: a77a8ade28adecad7c6e6f04324a8c5e7b3ffefea44e28e626b1a97f63a81540