Malicious PDF — malware analysis report

Static analysis result for SHA-256 52afe4003435a044…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 00:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0fe736012f887e9d0b3ee0e6e5cddb8 SHA-1: da554cf39eaf0b917ea5c60305faf6448ab48f12 SHA-256: 52afe4003435a04462be4a564316a8b31bac86c1db01976f7d564362b78071f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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 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 http://ylpqzl.com/ckfinder/userfiles/files/belobenezisisewit.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/gixitasiwarukojixekalas.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/99987591617.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/55261212104.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614352f030142---fekularapesizebufaje.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/dotimugadi.pdfIn PDF document text
    • http://a-pluset.com/userfiles/lepojodidolipetozaxifuv.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/57488124358.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/82024241531.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/76096115282.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/zikaleveme.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/92873824113.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/55365634325.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/kuzokufosamebipeniful.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/44620354075.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/zumopodujonasafedajonun.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/tupexowo.pdfIn PDF document text
    • http://enewind.com/pliki/file/diverunenolarifi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/fekikamirus.pdfIn PDF document text
    • http://kammed.com/userfiles/file/xeralaziniwo.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/79417601292.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/84120ac8fcd274bbf1dfb5526c5f5457/93382668545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=iphone+5+black+diamond+price+in+pakistanPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 11096 bytes
SHA-256: 01968b1ef3059ece2209bf3c67eceb3b50596e8724fc6bc52868fd17a48ba212
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 20544 bytes
SHA-256: 84befe95d78f7a21605117a8bc43565e812d3acefb97cf277e6e65d689999815

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