Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b374cf1446c2d6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 02:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fe0992259616c67fcc3bbba862103c1 SHA-1: e865fe0f97b401a82b5dcafe0842990602374c09 SHA-256: 98b374cf1446c2d6e9cfd2497ece32e6d21daf04cf805901e465acdddc100f35
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous external URLs, which is a typical phishing or credential theft vector. The file's structure and numerous external links suggest it's part of a link farm designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://fiberglasssupplydepot.com/userfiles/file/96679574514.pdf In PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/74521549957.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/54323629707.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/fefifu.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fozominupizubuxulol.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/60383135087.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/53462292256.pdfIn PDF document text
    • https://datenglagi.com/contents/files/18112858987.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/kunesozime.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/85165213520.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7b25313e---49759510782.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/4442476026.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xijunijuxozeneberemevidoz.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/73317733848.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/balejadafolarujuzapiguj.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/nerawof.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vabewigubamilajipepo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613929f19cf34---72886168496.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/kosekox.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/mumunat.pdfIn PDF document text
    • http://galedo.cz/www/data/cms_files/files/41252886491.pdfIn PDF document text
    • https://eventaipei.com/upload/files/dimofere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=son+of+sobek+pdfPDF 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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 17880 bytes
SHA-256: e9f1d87796bebee93655a545cdb985e4d2e44ae987027851b4ba4fa21a708666
font_02_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 10300 bytes
SHA-256: 98495a112dda06f3e3e9ef076d43c797d7419e29502bb0c19c0c9e8afbfddf99

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