Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a41c11050ee41b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 14:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68d61b6680b4e19465bc2eddd431352c SHA-1: 0ab81ae099ddec225fa44c218540d84761c8cf46 SHA-256: f9a41c11050ee41baaea72e2d02decf6314ed42929c1e246f7ff832c796c82d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to link farms and disposable hosting, suggests an attempt to redirect users to malicious sites or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature, likely as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/48476733673.pdf In PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/xunonuwenupenojenejakolil.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/17361912483.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/67008567770.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631406607.pdfIn PDF document text
    • https://netlandschool.cl/files/xijowilapigipo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dorezaromagofizon.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/vatizozitesunegixor.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/47840071775.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/tipivojabukoti.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/13618164718.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/xamadudami.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/34364419628.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/goxajepixuwi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/lebizegatapabilumofogekiv.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/42972803568.pdfIn PDF document text
    • http://thecuriosityshot.com/jisipe.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/rufoledavogeturisolejaf.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/21236613488.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/vediwozedawuwumux.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/70729037224.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c2f87e9652380228d4b444e433362ba2/29672181373.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/31987106398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=snapchat+apk+download+latest+version+2021PDF link annotation
    • https://lapdonline.org/file/babikilubuvifufexinelox.pdfIn PDF document text
    • 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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 18996 bytes
SHA-256: e66c367344f8cec79a2158dbc582f3d7da1d93b3922367f7815266bc14c25cb4
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 11224 bytes
SHA-256: 362b8b89fc20ee17e637f092be397e8c09f7df7219c516d20c5ca2ed8c3b9fef