Malicious PDF — malware analysis report

Static analysis result for SHA-256 938ee4db380ecebf…

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 08:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9541f58ab1c49ba5dd1ab9578831cc8f SHA-1: 5dfea7d4694dc7e84d2362d13e9930737225494d SHA-256: 938ee4db380ecebfbfd450c2c3af610a75e5b24af98bc05212fef6435ef3febc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest the document's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://allytemp.ru/uplcv?utm_term=watch+all+of+us+season+1+online+free PDF link annotation
    • https://manhremhoangvan.com/wp-content/uploads/files/28694236044.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba2b77c0---23941301399.pdfIn PDF document text
    • http://balone.net/_upload/file///mupaguzilajot.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/61430574446.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/87555955028.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/muvowuwatepibizur.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/mifajojamujimuj.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/kolelida.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/26110839908.pdfIn PDF document text
    • https://samowar.ch/upload/file/zisiwelodo.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/povajolomevo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613478c16f133---12184252681.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/97557392035.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/majajenemarekazexomo.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/masamabax.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/38387127234.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/90599163287.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/farizagawa.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/kukolokegufim.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/45621897541.pdfIn PDF document text
    • http://twilaw.com/files/files/rubexipexikizagigina.pdfIn PDF document text
    • https://goodline.by/userfiles/file/32003245984.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/60531349340.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/58251882828.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/73717312869.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/84352817148.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://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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 10576 bytes
SHA-256: 30d5c04f55d70d2b6e8e4aa175cd8d6391431f4e0589fd8e52ad8ca3046d3cf0
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 17660 bytes
SHA-256: 469afe85b4f78b9d41bce9ccbf28e92a7b355db5ab995fa39f49b80f47aea775