Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e3171f32514529…

MALICIOUS

PDF

77.6 KB Created: 2021-03-10 22:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f85d5d5d1c3719121a25c339613c11 SHA-1: 2025a28b35f11c054487fbcdfd2016ee87f9ac7e SHA-256: a3e3171f3251452929a05e7eff9e38690aeb2841292c16cfe91f30179ad9d641
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary external URIs, 'https://druttle.ru/award?keyword=periodic+table+with+element+names+pdf', suggests a potential SEO manipulation or content farm strategy. While no scripts were extracted, the structure and heuristics strongly indicate a malicious intent to redirect users to a network of potentially harmful or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=periodic+table+with+element+names+pdf
    • http://juwupexutaval.mywebcommunity.org/what_does_terminate_mean_on_roblox.pdf
    • http://mujudesuxiropa.sportsontheweb.net/ronixigowanukekitowux.pdf
    • http://dikegebe.mygamesonline.org/4489068042.pdf
    • http://tijukilebag.getenjoyment.net/que_es_la_propuesta_unica_de_valor_brainly.pdf
    • http://newipufisatag.scienceontheweb.net/gevomumomunazisasiruruso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_d7d186c5a22a47cab4b5b785db5fbd01.pdf?index=true
    • http://wuxojawe.epizy.com/hcl_apprentice_online_form_2019.pdf
    • https://uploads.strikinglycdn.com/files/367beb62-7f6b-43c9-8e1d-7722d2de3fff/27359990673.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_d08becbf62c4417dbb5be15fd88a1341.pdf?index=true
    • http://bogalibamadom.myartsonline.com/vesugofujipuzodafumoburu.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_804f874d39a84497a0f95ff5ca1aea9f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43c66559-4b19-4272-a62e-d0a0350a333e/94644878285.pdf
    • https://uploads.strikinglycdn.com/files/3a61c2b2-cff5-4c8e-8fd6-b7989a3e14d1/pinigipuxuzamiv.pdf
    • https://uploads.strikinglycdn.com/files/8fd8cc3c-6e09-44f5-b333-beaeb01d1138/logitech_k360_wireless_keyboard_driver.pdf
    • http://megutid.epizy.com/1585511864.pdf
    • https://uploads.strikinglycdn.com/files/0d9fe0de-e87d-467b-95ad-2058e52ecc1d/forefikavo.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_3ba3e881b6ce4b3bbad39e03bfd68313.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6634bba-b272-4179-8395-6d7d2fbb1147/how_to_make_experiment_with_water.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_5f38b9a071e94ec6b9190a5d73bd3e08.pdf?index=true
    • 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_off0000f28a.bin
3cccb5423e6aab85c13219f09b39f9619637a30180ecc72605d37ce0a434d85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 5628 bytes
font_01_sfnt_off0001058f.bin
7661cc8debac8e323397f0d3563a8487eec8fc3287e90fe7e55bc41464aac97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10412 bytes

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