Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8063bba24eb6dd2…

MALICIOUS

PDF

70.0 KB Created: 2021-02-10 09:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a212853e8876ba0afdf7a5e37c3d0fd6 SHA-1: e8da4a69c136b031518074aca2b1738b5875eb31 SHA-256: a8063bba24eb6dd221a4f68ea7d5544062fdb95ff17a2a1309298e0afc744f85
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=chori+chori+film+song+video PDF link annotation
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/776af19a957.pdfIn PDF document text
    • http://medtechnika1.ru/berlitz_spanish_in_30_daysmgfp6.pdfIn PDF document text
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/131762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_6004ac2eb7e00.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/zimes_lalefepabufal_mejesukarele.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/cd67e20.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/dc776f5d3.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/rotetaw.pdfIn PDF document text
    • http://lolkek.xyz/libro_robotica_para_nios4fag6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5fee52104d324.pdfIn PDF document text
    • https://limavewudadeku.weebly.com/uploads/1/3/5/3/135323498/vugefusirike-loviwakifo-jusosidox-tadarozipatara.pdfIn PDF document text
    • https://goxapixexaze.weebly.com/uploads/1/3/1/6/131607486/xabevulanajito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiporiri.rf.gd/lukojibiravatizuk.pdfIn PDF document text
    • http://satuzolo.epizy.com/uniform_costing_accounting_definition.pdfIn PDF document text
    • http://toxodetu.rf.gd/vebamob.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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 5188 bytes
SHA-256: fb4422b9d7fb12fa7b1934b5bbe2ae27dfb5cdf5bc57fb671325b449910db001
font_01_sfnt_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 11456 bytes
SHA-256: 3ba7a552b689a9face46377724536eab45bf5fc3b09c8cad5b6811b7cf9df6c7

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