Malicious PDF — malware analysis report

Static analysis result for SHA-256 199200598c667cb5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 23:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8a69060d585a204ab5f8d6b326c02b7 SHA-1: 372456005c26a01c0efbb917b14d986c0ddd4ab9 SHA-256: 199200598c667cb5524c7cda2a18018864a906f21d00b190f8a7181b2a065c4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, suggesting a deceptive purpose. While no scripts were directly extracted, the nature of the PDF and its embedded URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trvstore.com/userfiles/file/36966113374.pdf In PDF document text
    • https://speedwayinfo.hu/uploads/file/40601729875.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/tukerexo.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/69151295302.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///41328594307.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/puxilumuredifatule.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/15278355433.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/jabivirirosotilepezof.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/32289488997.pdfIn PDF document text
    • http://teakdeck.pl/files/file/72135114681.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/memotubevisedepa.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/61269963221.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9a2070479---99605443002.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3d85615e8786240664894e9227308c06/vimakow.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/3048250456.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/46020922931.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/29850888242.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/kuvapududoguzejuzamesojo.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/19163866863.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/nizavowop.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/gajefonadepokukukana.pdfIn PDF document text
    • http://cpviettin.com/upload/files/95244168327.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/vozogufokiv.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/wenipoboretik.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pugojitinuradesasad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+a+video+wallpaper+iphonePDF 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_off0000b7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 17944 bytes
SHA-256: 834cad66e523b754b19af1a7e1291fb573c1a30ea5e83aa16b6191ba387897d1
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10644 bytes
SHA-256: 94d5bbd6baa7ed658473442872f340f22e74d614b2711e5293d11fc53319a8a7