Malicious PDF — malware analysis report

Static analysis result for SHA-256 71acf924802f3b76…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 08:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 652a097eaeef115ff3e7e2d72da5743b SHA-1: f3bfd297290fe0faf2b8baceaa49f952f6ea9724 SHA-256: 71acf924802f3b766843d9c2e4524ea3b404bda18780f81a4fd361e55946a478
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's likely used as a lure to direct users to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://zamgph.com/uploads/file/141134333165.pdf In PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/74842461807.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7d914add---mifawitudofawewukiwesis.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614811dad0eb1---bulabofekarezod.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/salimenudumatasulamuzux.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/39a097d04902c1d7eb9b6ac455c8ebfc.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/63937096357.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/79251307323.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/dibopejitugulugu.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bikoxop.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/86172862624.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/16922515847.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/36151914701.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/29131678830.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/remilikegisud.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161406d2c871c2---jogososedek.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/6275004714.pdfIn PDF document text
    • http://apvn.info/userfiles/file/rubobotarewekosumebavu.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/8489458254.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/48162063697.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/worofe.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/30222035370.pdfIn PDF document text
    • https://thehouseproduction.net/file/jawafibe.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/misafigogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adult+apk+game+downloadPDF 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_off0000c0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10636 bytes
SHA-256: a7d6d835bd4bba8742b67a87cfdd5cab460923242845b5d939f68d9a0278fe57
font_02_sfnt_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 18004 bytes
SHA-256: b705949da64b0edd244575bc9a41883f3a4f78dee47efe43de067a55bf62534e

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