Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd2e356fa591a9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-09 04:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b23f866e7e67857746a883fee66bb428 SHA-1: c6cd6f6e7e76295eab7f9dd27b4c0072062d676f SHA-256: bfbd2e356fa591a9fcd7ce81d03537106cd136a50b2919a70b1315a397a727a2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=physics+basic+formulas+pdf PDF link annotation
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/9000157.pdfIn PDF document text
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/3c33e13.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/guwapufedopevex.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/verizon_wifi_router_admin_page.pdfIn PDF document text
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/namafutagaxibawuzi.pdfIn PDF document text
    • https://puxivulikuvudet.weebly.com/uploads/1/3/4/6/134663564/4034059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_600ba902d1321.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/muvuwiwozokazitubuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602f36a7892bb.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/nojovirisumesan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fedba03514bf.pdfIn PDF document text
    • https://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/zuxipakapelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/darewovamigirekekusixus.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/domufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce9c227-3f88-4b21-bfc1-85785a919368/32187300255.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/rurufofiwewedeli.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/zaguwutalonagewudug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b9f57d-e890-44a4-9d6d-b464445216fc/a_guide_to_rational_living_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2125a4b-93b1-468b-9236-607695223716/how_to_do_a_running_record_on_any_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c79bb26-1eed-4cb2-b8c2-595d46f9729d/9173285437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa90767b-fbca-46f4-93e6-1e817b29c5de/56621024349.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/75178856733.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/object_oriented_system_development_lecture_notes.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_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 5640 bytes
SHA-256: 4c00a9658f0ce0492d5aa67b17560beef09a33cac7791ca7556bab0927219655
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 11196 bytes
SHA-256: 42b29873c8c0aa5ddaa5e988e2aed70a028a3fea3c80cd60b7ff2cf310479e3f