Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8973d7cd65b4bc…

MALICIOUS

PDF

93.1 KB Created: 2021-09-14 08:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2195be8a726de929fae494f9978f466 SHA-1: bced2d48bbaf2db412466f594867fb340b3f3f81 SHA-256: de8973d7cd65b4bc45fbf4ef904c41932277b45f5f51b10151fefa7d6f3df6f5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body is heavily obfuscated, but the presence of many distinct, unknown URLs suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130104768056---kofutadativesos.pdf In PDF document text
    • https://aviseco.ro/userfiles/file/bonidagevajositufe.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/norukub.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/49105678157.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kefotexija.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/bifigagapitobibed.pdfIn PDF document text
    • http://guowangcable.com/d/files/23669191905.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/sosoxitod.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/zitulimemowanoso.pdfIn PDF document text
    • http://schokofontaenen.de/idata/zulux.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/vanafupimajojoxuvofisene.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/gixesejedefe.pdfIn PDF document text
    • http://ippon.lv/uploads/File/gipakijonovajuwuxamo.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xarutelo.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/bogalinejanazevemutuvop.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/68057139325.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/69570239220.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/12674449691.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/58225642536.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/65643168279.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/40424148180.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/menulazebipukotuloxev.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/witanojo.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/logarozaweruj.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/37078954956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=open+android+system+webviewPDF 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_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 10940 bytes
SHA-256: 7169d368ef00e58392ae3ff1ab2266374a6b75265abdc855134c6e13d59cd160
font_01_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 18160 bytes
SHA-256: e98b0839cec77d98a18680b2303076adf337459080f8eff6be14f250ff86c31a
font_02_sfnt_off00014eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1