Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f2f428b339dfd8…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 23:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba1bbaaf6fbcbce0a6fe95f47684ca37 SHA-1: 9923489984196d80dcb8c5a3a0fd722c2dc548a0 SHA-256: e8f2f428b339dfd85ffde867fc49645041f242d56916c541f52f9b334f27b8e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=polk+audio+psw505+12-inch+powered+subwoofer+review+cnet PDF link annotation
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/b7d924.pdfIn PDF document text
    • http://vivunijasu.22web.org/archicad_free_with_crack_64_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fd3695c32bfd.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/9815180.pdfIn PDF document text
    • http://cardioactiveufficiale.site/50011393986paq4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_600919229da41.pdfIn PDF document text
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/denorovisa.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/8bbe6c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_601cda61653b0.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/73b3c9abb06d.pdfIn PDF document text
    • https://josaboduzez.weebly.com/uploads/1/3/1/6/131637311/lemowizig.pdfIn PDF document text
    • https://rejonogatu.weebly.com/uploads/1/3/5/3/135392998/vekaxeguxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_6034011a6dd16.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/8471536.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/20a377ad6d46d.pdfIn PDF document text
    • http://copyrightviolationcenters.com/90180919455huaz1.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/5734459.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/korufemamakiwin_beriwiwovifire_libezixeji.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/pugijo.pdfIn PDF document text
    • http://vosutixovu.22web.org/aeneid_virgil.pdfIn PDF document text
    • http://dunizajo.66ghz.com/ruzavojotefilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumozuj.epizy.com/733592931.pdfIn PDF document text
    • http://pugotividat.epizy.com/3d_harmonic_oscillator.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_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 6084 bytes
SHA-256: 52fb48c7180300e71e74466b955f1b6a13988b2e79974746c8113e74fe9ffc0c
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 10824 bytes
SHA-256: 0a8f88b11cfbdb86918c2fb9fc51db37053dd2f87011a804da4917947ff245d0

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