Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8f1f60ecf374df…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 10:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d1f205782036d7cc7059b110444e5fe3 SHA-1: 84469582f0366f1d482a5dcd770b60098bfab817 SHA-256: 5d8f1f60ecf374df2a17a0a93fe1e4deabe23842bda2c18eca5d331e62266738
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moscowfashion.net/content/xuploadimages/file/66908834257.pdf In PDF document text
    • http://mintaialuminum.com/d/files/tezopojujitemiv.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/peditibezofesokujijokus.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/salefof.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/zewosegimob.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/73108645455.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/dizerumom.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/wawabinazosisi.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/sugofelujekebogugopadajow.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/19250287641.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/55875825576.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c96912c9---tunetemotutupokut.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090723534375.pdfIn PDF document text
    • http://atrsara.ir/resource/files/75208950402.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/6928805318.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/voreza.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/dukofulumoxid.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/46857890357.pdfIn PDF document text
    • https://tigapilar.com/upload/files/ronukesoxekaxo.pdfIn PDF document text
    • http://varvshistoriska.com/file/xexalasujikivaf.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/27222509565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+limbo+apk+freePDF 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_off0000c418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 17584 bytes
SHA-256: 3c9e5e4d36244ab72d5b140215099a44e9b899b3b8d6361afc8517ac72537575
font_02_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 10712 bytes
SHA-256: 8ae5de820c87ce2094498f685504cca98f2a53309b38c37cc5e9040872ca445f

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