Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f87daf68c6bdf64…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 19:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a981cb2c3e03f90aff6181aa3d9e79 SHA-1: 7856a5390fb5163b3fe5f96778fe90232e0683a3 SHA-256: 2f87daf68c6bdf64e3fd9eca5968be9657dcf271fed71150cc10c1100285fbf5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, indicative of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=american+kennel+club+shopping
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/dukil.pdf
    • https://cdn.sqhk.co/wadebekop/fPEgj9o/incredibox_music_video.pdf
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/2b3932babf385.pdf
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/mubexetopogivexiz.pdf
    • http://gejejasofubi.mywebcommunity.org/jedupokevijozo.pdf
    • https://rosotomana.weebly.com/uploads/1/3/4/5/134585450/netirubo.pdf
    • https://cdn.sqhk.co/fokofike/fjhhjdI/71010678227.pdf
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/pofufade.pdf
    • https://cdn.sqhk.co/kinemefuwa/jeckjdP/government_bursaries_application_forms.pdf
    • https://fawezodotemo.weebly.com/uploads/1/3/4/8/134871545/7539b0aa73e7.pdf
    • https://mofazutozu.weebly.com/uploads/1/3/4/8/134871383/roves-terufabaromi-rakagiliw-sulugi.pdf
    • https://zibomuloxeju.weebly.com/uploads/1/3/2/8/132815028/begugepa_muwem_jeromanuzuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tawovojo/gavedibutasik.pdf
    • https://s3.amazonaws.com/zasepo/83820993762.pdf
    • http://seroritubofa.atwebpages.com/winujutikojosalojon.pdf
    • https://s3.amazonaws.com/savifin/troy_bilt_horse_owners_manual.pdf
    • https://s3.amazonaws.com/sizadagazagaj/rakovedizox.pdf
    • http://sabiwilurase.atwebpages.com/nasutu.pdf
    • https://s3.amazonaws.com/sedimeraxufi/commercial_roof_inspection_report_template.pdf
    • https://s3.amazonaws.com/toguvaju/subtitle_alpha_2018_subscene.pdf
    • https://s3.amazonaws.com/pavujiniz/kojimikil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd2.bin
2bd06b2002cd79802168f4e379f32291e314a56a9ef5d61f03c1d275b1c730b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 5540 bytes
font_01_sfnt_off00010e79.bin
51b9a02556c5b83c848b9fcb16f0a9991fd3a9f7325ac6c43273c655df2cca92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 10568 bytes

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