Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d72fc9ff86e315…

MALICIOUS

PDF

43.2 KB Created: 2020-11-09 04:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f367e636f03f7d15948eff75948fec85 SHA-1: d692bbd0c7e6dfc279d84712eb07ca2cb8f27ba2 SHA-256: 53d72fc9ff86e3150d62f22bfa821459b3f769de03f828100438432aef678871
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=human+body+systems+matching+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417327/normal_5fa812e376378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f91373bc5a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f9968c2a3b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fa0bcd98c928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_5fa3f2d2c6fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fa708326af2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5fa3da5c33b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f8c255ab54c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8e29633bf07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fa7f65e67856.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gunamuve.files.wordpress.com/2020/11/donald_murray_the_maker_s_eye.pdfIn PDF document text
    • https://javevunugibu.files.wordpress.com/2020/11/castle_in_the_sky_orchestra_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1ba6d9-f6c8-4687-ab08-afced55e7367/torafexuwamemi.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_off00006852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6852 5680 bytes
SHA-256: 8af64b406d3d5516578153890194b5549d6ce03262f761286d3ad0493d0021a8
font_01_sfnt_off00007b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B84 10520 bytes
SHA-256: 38371c1aa9e0540f67345700b6673e6c80536a580256ac0096dc2b61f8d2188a

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