Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9205503afe89c01…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 09:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8737e9cd42facdb8d213fb2b614e46c6 SHA-1: f54a3e05b9b487ee6ad147367c89efa2c76c35e6 SHA-256: f9205503afe89c01f428472bda33a368225e3d8dd62c0d6ff805f0d83ffc8f2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure and embedded links indicate an attempt to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://doxity.ro/ckfinder/userfiles/files/51099503693.pdf In PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/85051756963.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907144749.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/zawibitakinotufopebig.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/61606856816.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/49548998748.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/56893903923.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/26083511264.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/44842881250.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b753bb64---19840764124.pdfIn PDF document text
    • https://denimder.org/resimler/files/wavozimunef.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kilojelinovixebuwo.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/logokasasawininami.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/futozakutu.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/luwozamisodegavode.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/zivikigosopazonamazog.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/62630171980.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/58487257652.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/1722199225.pdfIn PDF document text
    • http://labsshop.com/d/files/feworomivejejudude.pdfIn PDF document text
    • http://analhospital.net/file/files/51470382336.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/bejorozozixebakumulalipu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/7244819187.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/33645323658.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/51482079859.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q8pdatfre4ut55tehboc0lqng7/84803663808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=metal+gear+solid+5+apkPDF 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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 20932 bytes
SHA-256: 43d7cc018fe0f233e56da401870471d46d2ad40d71f8c1bf91b307024d39d177
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 10684 bytes
SHA-256: 5802e9d2a3907e319187efafa70d428dc6480887489b5c046918d65813d2e232