Malicious PDF — malware analysis report

Static analysis result for SHA-256 387db1971e270152…

MALICIOUS

PDF

70.6 KB Created: 2021-05-27 00:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 682f71a5d85063122e96edeeec34a3a8 SHA-1: 2ca55f1bba2ed82783637f4fe2270342a02e4b71 SHA-256: 387db1971e270152c88c648ccee7dd12152f2d900ce5d973f83f43c9e76f88b8
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary malicious URL observed is https://dugedepap.ru/strik?utm_term=voc%25C3%25AA+%25C3%25A9+insubstitu%25C3%25ADvel+augusto+cury+pdf, which is likely used to redirect users to further malicious content or phishing sites. The ML classifier strongly indicated maliciousness, supporting the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=voc%25C3%25AA+%25C3%25A9+insubstitu%25C3%25ADvel+augusto+cury+pdf PDF link annotation
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/517701d6a91002.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/131c7.pdfIn PDF document text
    • https://lewimovi.weebly.com/uploads/1/3/4/3/134311482/juvusidozoferonawuma.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/2272291.pdfIn PDF document text
    • https://punokoguset.weebly.com/uploads/1/3/5/3/135351172/56dcde.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/3355761.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/jifafok.pdfIn PDF document text
    • https://pudarafuweza.weebly.com/uploads/1/3/4/4/134479559/422f4e7e23a.pdfIn PDF document text
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/9391647.pdfIn PDF document text
    • https://soxokelu.weebly.com/uploads/1/3/4/4/134494323/c548b10bb.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/5842541.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/02a67a199.pdfIn PDF document text
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/2441031.pdfIn PDF document text
    • https://xeresitemuja.weebly.com/uploads/1/3/5/3/135311884/fovuxipemidupoz_xixusirerizeni_jevulipo.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/xijujawupov.pdfIn PDF document text
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/5113292.pdfIn PDF document text
    • https://xezazevexu.weebly.com/uploads/1/3/5/9/135990031/3296925.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/mozareg-xipunesotavif-pizagomu-wumomiro.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/15ab64e1-41c3-47d3-9876-ca389f4eddc6/vogotegup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf85a25-83f4-4248-9075-3ecc27d53525/22719316004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c5fa978-9036-4298-a9e8-962efd32371a/bakupusumadetadixazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce6fd87-5ae4-4d28-b757-0c212e57f1a5/kuvurokujibefonebez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e902f2cf-45fc-4ccb-9f89-5f5a8b7563d4/waminipojuwutegafil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ee7538-c965-4f10-b1c3-d5c89c28d7cf/87968748013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb73c9b6-f2c2-417a-810b-bd6172527295/jvc_kw-r910bt_manual_espaol.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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 5936 bytes
SHA-256: b4b91064fb90540fc685c32416299e94f45d014970e239289bba48a40e44a107
font_01_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 11964 bytes
SHA-256: 92e92962f7082abf4c5dacd42ad5ad7436fb303cec3fab9d46da88bad0b93131