Malicious PDF — malware analysis report

Static analysis result for SHA-256 f868341545069168…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ea41780fe206a3ea81cc2c3edc63fed SHA-1: 998abf0a410152a6364ff23f82ae69da0ee7a401 SHA-256: f868341545069168725959ea976dcd3b06e0126154814744446c717a7dd3d669
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document's purpose is to redirect users to a collection of potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://biblioteka-belzec.pl/upload/files/99439651905.pdf In PDF document text
    • https://lp-tracking.com/userfiles/file/vilebutivul.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/gobuturagapegomume.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/jofarakobezekiguvuj.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/88670055232.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/lojazegiromogovelenojuw.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/joxidiw.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/jekomomoj.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/jadusulixilebupifav.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea42ecc48---64581724351.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/kosejuzebiwepanom.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909090804.pdfIn PDF document text
    • http://strandedtattoo.info/file/depovud.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/985621413.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/bakisura.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/daruburuzoro.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zegejir.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/rumolijosipebigomegidot.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109191123392077.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/bexisara.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/timomimamadapu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pimagunopugubenogonoraf.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/47830227691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=google+voice+text+message+androidPDF 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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 10920 bytes
SHA-256: 8384ff788dd32487c7464af8380942d57d30780a58587fad2481c43517f2e0bd
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 17596 bytes
SHA-256: 1bf8367db7ce304cca2a1dc96c6e883c5eb17e02ef93ceede4b3546b89c4e2af

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