Malicious PDF — malware analysis report

Static analysis result for SHA-256 691745a0e165cb37…

MALICIOUS

PDF

43.5 KB Created: 2020-11-03 02:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b924c733114beba06716addf5d011272 SHA-1: 1fc4852d1bfb3d53534000a12dbce91f5f9e9bf7 SHA-256: 691745a0e165cb37707061f3771102f48e11a6aab27dacf5703a9ac52613f3a7
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/aws?keyword=ejercicios+de+medidas+de+tendencia+central In PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/89380a16d.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/biwadotipugojefuza.pdfIn PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/934078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/82136247-8a9a-4c07-b0f2-4bd3d48d637c/faxomebonalozesituvifex.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/61509750771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e38b6d-fe5f-45b8-b471-c8527c943f04/oar_study_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/logic_gate_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032de364-e101-449c-bb91-3387c0f2433f/gagozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa81bc9-95e7-41da-ad34-848a12f26bde/electronic_repairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf446c20-1b15-4901-9e18-e8a9487aaead/ridefuzizadafupuvedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f544c8-94e8-48c4-ad59-9934057a1c11/cancha_de_indor_y_sus_dimensiones.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B19 4908 bytes
SHA-256: ff042b03aaba805bc99543dc1f3d417181a83b64b65c15acaf82826bc093db9e
font_01_sfnt_off00006ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA3 11440 bytes
SHA-256: 8e1e3084ff839eecfb7786e4fcf3c7cd2650ca2cc0d1bfb99e21a119fa30b924
font_02_sfnt_off000090f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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