Malicious PDF — malware analysis report

Static analysis result for SHA-256 3363946891742ea6…

MALICIOUS

PDF

74.2 KB Created: 2021-06-02 02:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3655f007f046f0bffbed170215f7b36e SHA-1: e37407609d6a89398e58dad435423d686bdea9e2 SHA-256: 3363946891742ea6099fa79ff910fce37a81f0d0b7e15ffde0245f0bc6d54e6b
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external links, with a primary URL pointing to a potentially malicious domain. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or redirect users to harmful content. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=gramatica+de+uso+del+espa%25C3%25B1ol+a1-a2+pdf+vk
    • https://faxemidarasagim.weebly.com/uploads/1/3/4/3/134341424/2931922.pdf
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5ff7cc4c59a8b.pdf
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5fd04d2375bc7.pdf
    • https://fudatavog.weebly.com/uploads/1/3/4/8/134894714/5aeaac6f.pdf
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/8572301.pdf
    • https://cdn-cms.f-static.net/uploads/4453888/normal_6036f5263c4fc.pdf
    • https://static.s123-cdn-static.com/uploads/4367273/normal_600380b014ec0.pdf
    • https://cdn-cms.f-static.net/uploads/4368998/normal_602d201b8c387.pdf
    • https://nafusifino.weebly.com/uploads/1/3/4/6/134615437/ridetasedij.pdf
    • https://cdn-cms.f-static.net/uploads/4488815/normal_601492819ed55.pdf
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fcd556fd83fb.pdf
    • https://lulogozikojag.weebly.com/uploads/1/3/1/8/131858975/7660124.pdf
    • https://static.s123-cdn-static.com/uploads/4383678/normal_6003649493bf9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/60869d1e-51e3-446c-b0db-3e86314aac26/lajaxedogovataxasefalediv.pdf
    • https://uploads.strikinglycdn.com/files/a7b9b600-252b-4372-a4f2-f42057cf82d1/78758229310.pdf
    • https://uploads.strikinglycdn.com/files/47fea79d-63fe-4d97-b2c6-756ea41b2a25/69782496972.pdf
    • https://uploads.strikinglycdn.com/files/c3a17a79-9b63-403f-bc59-5da3c84d4ad7/goditopowusuzakabalu.pdf
    • https://uploads.strikinglycdn.com/files/1ce12a81-09f1-49ec-a068-9d9d099fcf2a/what_is_statistical_communication_theory_of_identity.pdf
    • https://uploads.strikinglycdn.com/files/9720c0d5-7e03-4be0-9899-893084af4518/52150896392.pdf
    • https://uploads.strikinglycdn.com/files/41c97916-98c5-4128-8264-8c0576a04019/what_temperature_does_a_morphy_richards_slow_cooker_cook_at.pdf
    • https://uploads.strikinglycdn.com/files/59d2862a-012c-4c2a-a073-5dae7fe46919/sonaputobavumofagaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d7.bin
1e62d4f24b40fbc528a9a8d495e291b99be14a388a49f88b579fe054812c3947		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 5884 bytes
font_01_sfnt_off0000f5a4.bin
f12124b35a276612102fb92c86dea7eb33cae1f5b8f3155e64dc587b57da88ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10448 bytes

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