Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecd89254ec1b27f…

MALICIOUS

PDF

75.8 KB Created: 2021-01-14 06:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2903f6c2e6b96f9ef6d3433d5fddaf04 SHA-1: c46324770a29a5cb0f827ed187bb232541818107 SHA-256: 5ecd89254ec1b27f37c8a577187e1ef3b9a40b5533fb723aa451fe663d531908
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 hosting services, indicating a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

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://traffking.ru/123?utm_term=solving+exponential+and+logarithmic+functions+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fd99882e9e14.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/bafoxegof-taruluxozi-nigabegi.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/Zoicjd1/5249417035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fa0a904225f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5feb0b0f36110.pdfIn PDF document text
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/9052917.pdfIn PDF document text
    • https://vojesegavosoza.weebly.com/uploads/1/3/0/8/130813146/nivowozuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_5fbc8e7b42e8a.pdfIn PDF document text
    • https://site-1248937.mozfiles.com/files/1248937/70981731063.pdfIn PDF document text
    • https://site-1175287.mozfiles.com/files/1175287/82367244530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fe23ba23b1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fe6dea7c919f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ffae7d8c3665.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/4a3125c348f31ff.pdfIn PDF document text
    • https://cdn.sqhk.co/nudizodi/Mjbgghf/filenoduwila.pdfIn PDF document text
    • https://dubuzimonovox.weebly.com/uploads/1/3/4/3/134347386/5174163.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/vapenixe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 5956 bytes
SHA-256: a5713a5afb9130a4402ad61acb131f40b40f370c1c326c0ee4a57555d58ac2da
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10744 bytes
SHA-256: 8800bc20e66f526b37d88488ecb1ceeea321780c711d1e7b99a94e07ad8ae07d
font_02_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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