Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2a0466b66a0be5…

MALICIOUS

PDF

76.7 KB Created: 2021-02-25 21:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4e7dde1565c5d4a8fb85569b787fde6e SHA-1: 22814a61baec1f2eb7c570ff72e1910defb98d18 SHA-256: 8b2a0466b66a0be5f84d46d4958bdf09c8bf59f7a3bb3628aa85d1c802f7edb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to PDFs hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML_NYX_PDF_MALICIOUS heuristic also flagged the file with high confidence. This suggests the document is part of a link farm or SEO manipulation scheme, potentially used to distribute further malicious content or drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=warframe+excalibur+guide+deutsch PDF link annotation
    • http://skout.tech/75720928837k3fr9.pdfIn PDF document text
    • http://lalashoppen.online/lofobipozubozesoteg1zxld.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/japetaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/gdAQojj/gaxeritorogokaki.pdfIn PDF document text
    • http://andyhongdigital.com/worijilitaxuzakojuxobgl5o.pdfIn PDF document text
    • http://bettermoneytips.com/80448771836k8eip.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/ig0jcie/fufoguwetamu.pdfIn PDF document text
    • https://buzoxebujodi.weebly.com/uploads/1/3/5/9/135971705/fevepibukemew-woxelezenot-kapavijadaxo-limirafajimosol.pdfIn PDF document text
    • http://kebawed.iblogger.org/wovirutu.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/GaYhiSS/pekesesijisejivegakaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/iaBRC97/zusobasedikenaxunot.pdfIn PDF document text
    • http://vquest.website/microsoft_stream_permissions_externalv52ck.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/e3e07f55e4b068f.pdfIn PDF document text
    • http://labiosdewonda.com/79727829745rfyuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonegukum.epizy.com/61115933555.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 5656 bytes
SHA-256: 3b23c708fca6ae59c813d40ef6d8105a9ba95c74cfb215828f5d2dd28d691181
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10372 bytes
SHA-256: 7fe62b8268746b291096128b66ff255d66d7d3f6c0d1cbb248eee5b91667a0c8

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