Malicious PDF — malware analysis report

Static analysis result for SHA-256 b701a19c2a61ae96…

MALICIOUS

PDF

75.8 KB Created: 2021-03-28 11:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a6fcde335a1c19e40e524ed77f3e379d SHA-1: 7d3b08a78436bd6037ac3100e0647b9b217b13cd SHA-256: b701a19c2a61ae96d3a8e9d3e10460ab4164e1387fc86380baaa68ddf9580fc8
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within it. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

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://botokaw.ru/strik?utm_term=how+the+british+empire+changed+the+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fdc4f044840b.pdfIn PDF document text
    • https://bajusokizuz.weebly.com/uploads/1/3/4/4/134400974/7901538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fcece63a98ae.pdfIn PDF document text
    • https://xutevuper.weebly.com/uploads/1/3/0/9/130969179/tebim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5fd9149619d00.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/lipeku-logurufuwe-mumale-duwogomoziziwam.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/gazoxef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_603f7ef27c0a9.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/sgeq4he/tech_geek_store.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/29f3db615665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5ff85602abe05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_6046321555d47.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/txicjgQ/safogutivevunajudurilus.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/vulafafiredire_kulorepo_gomuleduzuwuda.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/2142193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_905c9d1050814d919df5d3ee55807b6b.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_f558f949e7f94499828f63fd0f9cacaa.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_cb878ccd2d5649b2bf046b1b96369b7c.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_c62aeaa248724387a5ef839c182f4937.pdf?index=trueIn 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_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 5680 bytes
SHA-256: 88c507e092dd210d3566b590a0b1da4ee9645add0f6331f8bc70a90927649524
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10592 bytes
SHA-256: 8b554ad922aa17c5343a5e57667766796991b92a042f3310bdb01e28a3ac3321