Malicious PDF — malware analysis report

Static analysis result for SHA-256 4340c0127786c45c…

MALICIOUS

PDF

71.1 KB Created: 2021-02-20 01:27:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a9427ba9ec31975ea91d8b580b94f0e2 SHA-1: c4f35b20177374c18ef3a05ae06cc35573ba11ea SHA-256: 4340c0127786c45c0f54b61133c6c833576a5eab4d43d3c367aeae6b95373872
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a primary URL pointing to a site offering 'different types of textures examples'. This suggests a lure to drive traffic to potentially malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://seumenha.ru/wb?keyword=different%20types%20of%20textures%20examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5ff4d1c6b034d.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/e0ujhs1/79577208128.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/hgfcchb/cinergy_theater_midland_texas.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/97cde.pdfIn PDF document text
    • https://cdn.sqhk.co/vopiruwikil/xlhglie/82320570720.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/nexisan.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/1676589.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/3660075.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/somaxamuluf.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/fnAMny9/domino_party_set_6.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/benubapopikaj/schengen_visa_application_form_italy_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/36237173986.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/73735983697.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/rigowetupemogaf.pdfIn PDF document text
    • http://tolokob.rf.gd/business_case_template_excel_mckinsey.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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 5216 bytes
SHA-256: bf9e0a8e20f040cd74d3febc1c830bb06bed8c2db4bccaaffe9da963370c3466
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10400 bytes
SHA-256: 224532bc241782e5db232c42dd45de92db28aa2823c305b673cc9d6f477ec693

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