Malicious PDF — malware analysis report

Static analysis result for SHA-256 53036c0159e05a3c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 19:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34f658aef5108f6f244a580d967abc65 SHA-1: 36c9613fed41f186f391a8e72144497df4fcbbae SHA-256: 53036c0159e05a3c4945567fad68a50580446a6287a097c47ef2b6cba8407c24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pilot-market.ru/new/files/file/mobunetig.pdf In PDF document text
    • https://4cmedica.com/ficheiros_upload/file/jijiwadu.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/vojuzad.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161367557bccc7---migepeminoweresurolakefe.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/21614829666.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50397857994.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/dilumitatijukabiwuluvexo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/vezedulipazokovabozegonot.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97320412800.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/10988378264.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/31681305427.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/rulem.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/tamun.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/juletubareniliguzal.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/gogidijiboduwaka.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fuburowiginomisokezupa.pdfIn PDF document text
    • https://keongracun.org/contents/files/60512182399.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nenod.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134af8eda12f---kugaribazetuzugagus.pdfIn PDF document text
    • http://taigesw.com/upload/files/xedon.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/gikolelazanizodo.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/batijumatobowijamaxotodep.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/71802212508.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=t+mobile+scam+shield+app+downloadPDF 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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 10768 bytes
SHA-256: 9d81427d61d8e1aa2c7079dfa20de1b2398e19275da860c5985056b1c4d5fb62
font_01_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 19660 bytes
SHA-256: 714e2a8acec2108abc7b36069d3f1ecdfcddda2e131437aa4f719061bb10d02c
font_02_sfnt_off00012aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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