Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a6c2e98fc7992f…

MALICIOUS

PDF

47.7 KB Created: 2020-11-06 21:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e7192b829ba2857fcd8432704cfb0be7 SHA-1: ee34ccecb62d5277c2c9f5063d558b71564eef9c SHA-256: 36a6c2e98fc7992ffe54af76b8243ec53f4e55174cb927f22bf6b433ad823130
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, with a heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of external links. The document body, though partially obfuscated, contains text related to invoices and payments, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of multiple external URLs, including one pointing to 'trafffe.ru', suggests an attempt to redirect the user to potentially malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/aws?keyword=newspaper+in+broadus+montana PDF link annotation
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/e9dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5f9e1854e5a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f89a1f2b363d.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/5703209.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/1986afa0-923f-44c9-9b65-d41ba17c83b0/10383722037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50974e3-e364-4e86-9e40-668c0aeed237/gobasuka.pdfIn PDF document text
    • https://gezovuxa.files.wordpress.com/2020/11/60980608025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8195e6-e5a2-4f06-90b1-97e4cdd6fdd6/2020_bassmaster_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3806f126-9edc-442b-a437-410fe2c731b7/xiwowarewemavumul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57b17c6-24fb-400f-8e2a-0f8545ba82c6/baluvegimefijoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bdcd6bd-df5d-416b-98c3-4249d9e9cd0d/76418412832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811d33ac-74a7-440d-a672-45e16189461c/forum_sinema_saatleri_izmir_hava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0580201-8d80-40e0-a0df-a9d9a82f598b/tajujamonozadofov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff96e90d-cc31-49b8-af37-8b305d8ba925/91129487713.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F4 5276 bytes
SHA-256: 07e2f8066742496a913e3f81dbb5a6037027a0b681fb8fd98cfcc1b637995bcc
font_01_sfnt_off00008bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDF 11152 bytes
SHA-256: 25648dce5c58fad6f6b2cfab11854662524ab99ca3536cd56acb7cc1d713b2e3

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