Malicious PDF — malware analysis report

Static analysis result for SHA-256 c546a3a771e500b4…

MALICIOUS

PDF

73.2 KB Created: 2021-10-10 05:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e0e9fda295530ce9a4d306adcd0cc73e SHA-1: c735610d8bc38defea7aaa843c9e10b96b6c43a4 SHA-256: c546a3a771e500b4e2d2338e1be1e74bed03557e16c83bea91d2978ff1474a58
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF also functions as a link farm, directing users to numerous external URLs, which is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://leavereview.com/customerinterview/ckfinder/userfiles/files/88237792083.pdf In PDF document text
    • http://soyaksiesta3.com/userfiles/file/mozinifiralimiginuxerasow.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/xesutegagokotojimenapu.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911064322-jisuzapikifokikilulumid.pdfIn PDF document text
    • https://digireg.cz/upload/busamudokomonu.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/luvuna.pdfIn PDF document text
    • http://divelife.kz/files/file/22321612047.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/digiwa.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/51148980664.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/74897826693.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614173f2263fc---75441396434.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/datikirevobawewolan.pdfIn PDF document text
    • http://www.520amis.com/upload/files/bimeka.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/47746897289.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/90074263881.pdfIn PDF document text
    • http://chinalabware.ru/d/files/rovaluru.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aeb9d4fa---pawerirudagidizezanurizor.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/97057507358.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109201826512833.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/32685335034.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/74409908922.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/safix.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/nipasotavipiziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=soft+skills+for+college+students+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_off0000bc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC49 16376 bytes
SHA-256: b6ac96bf7852a4033a0148979f1e75613b485fe50e2a5a3233726dd2c517281f
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10900 bytes
SHA-256: 13da8a7ee8576eac88e672464701dd093e5fa6279d629e4048ea4d013d00cc65
font_02_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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