Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eac1f17c9261ce…

MALICIOUS

PDF

46.1 KB Created: 2020-11-05 19:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 93562639c60be924f7ddd26b8928d51a SHA-1: 22d3d7f9960b0466e2003c045e8ca4073c06b479 SHA-256: 21eac1f17c9261ce0fb80e10d16b9a93ffbbbec3b6413008af2027015656bd55
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=small+craft+pumpkins+in+bulk In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/3c29a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b04196-2a4e-4e29-80c6-6e16b49e283d/99463617452.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/logifipivifaxokufuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a87ca33-43ef-4681-9287-76ec3d5ec461/22987360288.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/skyrim_hide_helmet_se.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/solar_oven_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/98629770885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b7df58-a2d0-4c6c-9f48-49aea76bc6da/539292973.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/west_b_writing_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/clases_sociales_en_el_feudalismo.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_off000074a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A9 5468 bytes
SHA-256: 0b388cdd527701ce6b916bdb57ec7ad88c96997e52907c78758e6ea089e03b1d
font_01_sfnt_off00008723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8723 11068 bytes
SHA-256: ba2eb39081e40b848e4bb0a9bbaf4852691bdc07cde1da867926c19130bc35f6

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