Malicious PDF — malware analysis report

Static analysis result for SHA-256 c931099e65b23000…

MALICIOUS

PDF

72.7 KB Created: 2021-06-05 21:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1894032f4409e7ca1452146338473f10 SHA-1: c788beea2201b14fa43a2ed7b4b0ec3699df71a9 SHA-256: c931099e65b230007babf190e2319ccca02fb5d66728f5a5dc10f52b256cf0cf
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a URL related to 'how to remove cement washing machine', suggesting a lure to a malicious site. The PDF also utilizes a link farm technique on disposable hosting, indicating a malicious intent to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://infrive.ru/pbw?utm_term=how+to+remove+cement+washing+machine PDF link annotation
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/267f62.pdfIn PDF document text
    • https://xizadaxegux.weebly.com/uploads/1/3/4/5/134512129/da8c83548b14.pdfIn PDF document text
    • https://buposaxive.weebly.com/uploads/1/3/4/4/134494270/3006047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5fddb56acb273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd67c91547ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_60226ec025312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_606933ee490c9.pdfIn PDF document text
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/bomaruvulijozi-weribam-juwitexogafere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_601d8df7e97f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_606d39d005be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_605d6c8e2f7b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_6063c76cc9ca4.pdfIn PDF document text
    • https://nonaparipito.weebly.com/uploads/1/3/4/2/134265999/pidudinebikenab_bufozijupagedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144596748/21899986996.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/caracteristicas_principales_del_modelo_atmico_de_sommerfeld.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144422292/69837674700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c024e65e-de50-480a-945d-196ea8da808a/79713173754.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144551088/nice_2020_cars_under_30k.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144590736/how_to_see_archived_messages_on_messenger_app.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144543369/zowuxafesam.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/74877845152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4e4fde-8cf1-41dc-a41d-7077c25cf5f6/feh2o6_3_name.pdfIn PDF document text
    • http://garigor.pbworks.com/f/27109369688.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144629847/gta_sa_ios_apk_obb_lite.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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 5292 bytes
SHA-256: 4f3207cab383aef8163fb651169fbb7058931d7a15b67e3da3abe40b4645f5e2
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 11612 bytes
SHA-256: 37e99b61c35b5aad967eab61c5bd035df8395c04595f50f5c4637387acf443cf

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