Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d539feb6e559762…

MALICIOUS

PDF

78.9 KB Created: 2021-02-24 01:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8912dbe08ad2125617a8bc144c8412ff SHA-1: 7606c7bfba4f927c4b2d164730a8d4345c0d4f0f SHA-256: 2d539feb6e55976288ea1e87f43d6580b564f6fb6999dc0916621ad56345f44e
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The embedded URLs and the PDF's structure strongly suggest it's designed to redirect users to potentially harmful content or facilitate further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=machine+platform+crowd+harnessing+our+digital+future+pdf PDF link annotation
    • http://klossheff.xyz/as_is_process_mapping0glb5.pdfIn PDF document text
    • https://cdn.sqhk.co/bavisimupux/iWjcgdZ/toxebefubibupuvilopunopu.pdfIn PDF document text
    • http://mazers.fun/45400234287cwh1p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462368/normal_5ff2c30482030.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/sKjbAsP/waregozi.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/gl7e5hb/30455970098.pdfIn PDF document text
    • http://accueilcmb.com/212665891979x176.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/giV8Qgj/dobuxigemoveruzenojus.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/geGRAge/9447034723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_6016c3cfa4edb.pdfIn PDF document text
    • https://cdn.sqhk.co/dawupana/ijhaifN/61222355363.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/gEggGrs/ultimate_survival_manual.pdfIn PDF document text
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/labilulibe_bemabaporezo_palebitolu.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/ThiKzhg/put_the_solar_system_in_order.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/5469986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 5668 bytes
SHA-256: 8844ad331d59e79c41f09e60a61ec6052674ee4f31464a202ec05d7cb84cbd2a
font_01_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 10716 bytes
SHA-256: b3db23c26a238fee9663be32c4a9dcf62505d3a8b15d93e491a56ab1918eb75b

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