Malicious PDF — malware analysis report

Static analysis result for SHA-256 4938804c2a2388b4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 12:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fea29096013d0f584932fbc3c24f3a8 SHA-1: 510e50e9c4f14865aa1e440f3625017928eb3204 SHA-256: 4938804c2a2388b47b3f680444646463faf0a26cf6d03cd114e291d18a9fecf5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs pointing to disposable domains, indicative of a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, a common tactic to bypass security filters. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://insureavisitor.com/userfiles/file/59794500241.pdf In PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/15249555611.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/60059610530.pdfIn PDF document text
    • http://emannsltd.com/userfiles/65519649862.pdfIn PDF document text
    • https://premiersuli.hu/files/files/rasujotizopokujidop.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/77452836461.pdfIn PDF document text
    • https://aademvegabaja.org/images/image/14864742195.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/zosakava.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/diriwomofebotagosusuro.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/70199419590.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/40674538699.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275369981a---84585365353.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/sovope.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/vasebebiniwefefutot.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/sugetefarul.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/ratakanomubopuxuz.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/88447766015.pdfIn PDF document text
    • http://moneymaker-gold.de/files/jejuk.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/70479709.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/walelitijapijazila.pdfIn PDF document text
    • http://imbirimbir.ru/files/kalakirebejogat.pdfIn PDF document text
    • https://signika.pl/Upload/file/refunubaxexorowikaxodemur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=reelsmart+motion+blur+crackPDF 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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10768 bytes
SHA-256: 3542a707fb8636381c79d45b40b530264f57311ed1e09114e52ea8ca9cb4ff97
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 18912 bytes
SHA-256: 0359ce7b191b1292dde17f8e3c3229a19cf1b10373f9351200635bba3a8fcb51
font_02_sfnt_off00012f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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