Malicious PDF — malware analysis report

Static analysis result for SHA-256 66915bd9fbda7916…

MALICIOUS

PDF

46.9 KB Created: 2020-11-05 16:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 4cc838793813817d1ae17085ea86a52e SHA-1: 182cf08e722e12143dae8a4108bf997d331a2ddb SHA-256: 66915bd9fbda79168889f90b5565f4c86b88d35e53bef8d6582c14ce37aa462d
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffking.ru/123?keyword=laws+of+thermodynamics+worksheet In PDF document text
    • https://mejapibidar.weebly.com/uploads/1/3/4/3/134315264/vuluzajokako_vebizegimuf.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/nowokil/campus_tour_guide_duties.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/ohm_s_law_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/helen_of_troy_curling_iron_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/amc_theater_boston_assembly_row.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/94618821782.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/sugaguxagu/nutritional_assessment.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/gajabedafot/the_process_of_parenting_9th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/penelitian_pajak_akuntansi.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/30082502835.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/cpt_2017_professional_edition.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
    • https://s3.amazonaws.com/jewizopukuIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000736b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736B 5428 bytes
SHA-256: a9bd36033d1093f5deb41c72ff6fbf0afc0b41d8e41d2949dd087d6b9137b481
font_01_sfnt_off000085d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D7 11660 bytes
SHA-256: 2de833223f9866d9c46a8c934497d3f39552165e5ead0044bc14380695ee56c7