Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7338d55a4efef8b…

MALICIOUS

PDF

82.1 KB Created: 2021-06-12 01:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d95b982613f68195619f03a139c9846 SHA-1: 3dd6137589037b6ce91fd3a9ef3348430c579fd2 SHA-256: a7338d55a4efef8b22d21af4613ec4911e1ce19e81a90b46ccf359285323f079
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains keywords related to 'free movies', a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/pbw?utm_term=free+movies+123+unblocked+movies PDF link annotation
    • https://ginataxidorivez.weebly.com/uploads/1/3/4/0/134041929/vavirudogomifakojez.pdfIn PDF document text
    • https://kutikeso.weebly.com/uploads/1/3/4/4/134490414/315c6df0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fe03a9cefde1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_60445c4d93151.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450727/normal_60b4970289a49.pdfIn PDF document text
    • https://durewipi.weebly.com/uploads/1/3/5/3/135301904/982ce2703f4a8.pdfIn PDF document text
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/pabigedujalibo_mizosip.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/xikogi.pdfIn PDF document text
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/8667134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412767/normal_5fee54bd7bb06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_605215ec2b6b7.pdfIn PDF document text
    • https://zobimodajozo.weebly.com/uploads/1/3/4/3/134340865/4d7febf4124253e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5ff6b6bbeb235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_601eff300cf01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144674931/flow_hospitality_training_answers_gdpr.pdfIn PDF document text
    • http://fezosubi.pbworks.com/w/file/fetch/144782484/the_warrior_ethos_steven_pressfield_summary.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_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 5444 bytes
SHA-256: 6b157e00216a3ed170c7c925f35f36386c095f23d8fcd7c6d8e62c6354d722e4
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11592 bytes
SHA-256: 4a8a1bd5916467c26081020c2b9a42d347de6c1cc0a90ac2b34071a8e4472e94

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