Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b62dc722d5e00e…

MALICIOUS

PDF

54.7 KB Created: 2020-11-07 09:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2abe7207b79659f232523c4aba7278fb SHA-1: 19ce0f85bb275eae652b258d3e52832143afe7d0 SHA-256: a5b62dc722d5e00e991484cabf64cab494b476cf7ba777d488727a55810c640c
192 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?keyword=land+rover+repair+manual+pdf In PDF document text
    • https://puxugewukuniw.weebly.com/uploads/1/3/4/4/134492634/defeluxutas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_5fa5e27a980ca.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/futuvexelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_5f9b5fafb8929.pdfIn PDF document text
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/tegesib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fa34d8da0553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5f9bcf88ae812.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/molusofunawi_vofesas_dasonupol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f9f3a69be8c3.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/e11e1b3b-7a22-4735-824d-1354432a1a67/voleybolda_sma_drilleri.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://virinumit.files.wordpress.com/2020/11/on_parmak_klavye_dersleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4be6aa4-207c-4edd-a048-5acfdde976a9/belgariad_book_4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75EC 5012 bytes
SHA-256: abd8195ca9c0658c693cca487e0caeaf7b0a8779c2b4a45520eaed08b225b88c
font_01_sfnt_off000086f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F3 16080 bytes
SHA-256: 2004006ba26feb5aeabde7acc9765127397e742a3c936ead5818c02a55e84415
font_02_sfnt_off0000b85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85E 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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