Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fe9d4e02a02921…

MALICIOUS

PDF

99.0 KB Created: 2021-03-22 06:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8bc20f27a83f6d4faf644ee165e531ba SHA-1: a84b7bba6e3d215b3797f671bb4c98dda455e199 SHA-256: 48fe9d4e02a02921ce956c96f9dc5e4f1f15a862779a151c56ff38cbc6feaf80
126 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDFs, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of many external URIs, including those on disposable hosting, supports this assessment. While no scripts were directly extracted, the PDF structure itself is used to facilitate the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/award?keyword=difference+between+ethics+morals+and+values+pdf PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/9iiBjcT/sport_management_jobs_hiring_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rubalibuzodi/jjjiHic/85238011172.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/rojiwewewapori.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/8946711.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/jWjdibG/shoot_bubble_deluxe_download.pdfIn PDF document text
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/9585168.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/jeEjije/stair_runner_rods_gold.pdfIn PDF document text
    • https://sijanobodebalu.weebly.com/uploads/1/3/4/6/134639398/ff09429e.pdfIn PDF document text
    • https://vagipirisixo.weebly.com/uploads/1/3/4/8/134861957/9357625.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/jbjjCwQ/89904473447.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/fm6hdrK/photo_collage_apple_app.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/X1iage3/bare_knuckle_fighting_championship_13.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/cijgfcv/28039489821.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_3a9ee5f18e5e4eebb5e3cfc089a8e0e7.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_e7696b25943a42bfbaf0235ec1541849.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_6f2f9f5e022740c488cded6591ed69b5.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_22d60c89f0e14a9d945ae5c31136e342.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_e4764c73b84b40a0b4a086eebf57a2de.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_de2ed777c6c04a758880a561a9e5c9c6.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_5d8295c0e46542d7a9e0e75a35409ce0.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_ff72999fe9884ad083c693a23b2c8412.pdf?index=trueIn 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_off00014678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14678 5684 bytes
SHA-256: bacb4c1a2ada5c10dc6b73df2b367c24aeeec62aa1ede75eee0e18c4ed28c740
font_01_sfnt_off000159c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C3 10720 bytes
SHA-256: 44de8833c9dc44a42888f4f32083013a8a71eaa02f89d78be0cf31cab53e54cf