Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13acd53596a84a3…

MALICIOUS

PDF

39.6 KB Created: 2020-11-05 21:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 247aef7bab8edb00f158a345b77da670 SHA-1: 3d695e1db3c058b5fe50fc3acfbb08346b9b847e SHA-256: e13acd53596a84a30bc5e1b873de0e864f0c5dd2e528b06330cd2b2f09004862
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful content or further stages of an attack.

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.
  • 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.
  • 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://traffset.ru/wb?keyword=darren%20robertson%20realtor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8b19716a491.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/4016120.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/7dfcd9979b3d.pdfIn PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/7846712.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/zajegajusije_zofupojukevewa_datij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_5f99d758e5671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f991e9e50748.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/783806b2670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fa20793ee148.pdfIn PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/888b6de43470d2c.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/ad8f6b84-a686-406e-99cf-40b6af264a44/kinagoxedare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3925/1870/files/nasova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e296e529-96b8-4cde-bf23-2ed67ad3dcf4/vezeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8207/9126/files/3_tier_client_server_architecture.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_off00005ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED4 4816 bytes
SHA-256: 66be2517cb5ab2385f4aec0bd67bab7e7091403c5b6c7349e21366014e92308e
font_01_sfnt_off00006f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F43 10244 bytes
SHA-256: b0d9afaac148959152f4f8f19a9803742eb21d0e00b3d5ffb7d69a2e88559ec3

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