Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63e2de157644a5…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 00:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3be446773f63a8c97be6033acf27e522 SHA-1: c7b0dc649975212503ef83a0180a9cb1040d944a SHA-256: fb63e2de157644a504582352e6a1d73a9fe3f4fa013fb112044d3ce103a2ef78
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for distributing malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/123?utm_term=nursing+research+generating+and+assessing+evidence+for+nursing+practice+11th+ed+pdf PDF link annotation
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/3125058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_6005fc88f2ee4.pdfIn PDF document text
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/piduwi.pdfIn PDF document text
    • https://fikuwigo.weebly.com/uploads/1/3/1/0/131071253/wovuxovopulufad.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/241605.pdfIn PDF document text
    • https://vekukedabil.weebly.com/uploads/1/3/4/7/134710008/2655332.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/7300826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6035c48ebbd68.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/c9d70db40b.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/FigOifM/bejuxevufe.pdfIn PDF document text
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/pobawumi.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/jeribage.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/66898a03ab51.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/mirimulovugol.pdfIn PDF document text
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/7293e061ad.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/lososimap/dufigujikud.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/graphic_designer_salary_in_us.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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5464 bytes
SHA-256: 4b8917d0e58ad54cd122b32cb0e534145e2f2c82f8a8971e8cf92cc74c705f73
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 10856 bytes
SHA-256: c39bd71fd040a161a5f00e86a127a425d4f131da1cae51ef48bdfdf0ce4fa38a

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