Malicious PDF — malware analysis report

Static analysis result for SHA-256 db363160eede7a3e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-23 01:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0824158e999c23cb152153d09479f2d9 SHA-1: e188b5f42c8b1bfe8c9ded3756050a28e6967704 SHA-256: db363160eede7a3e34c5ac923fc65c09fb4df6816650a16b5efeeed341fb5e1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some of which are on disposable hosting. One URL, 'https://oniceh.ru/uplcv?utm_term=download+split+screen+android', suggests a lure related to downloading software. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=download+split+screen+android PDF link annotation
    • https://hmanagement.net/userfiles/file/lovorogesewafenorival.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/kidixigegifozig.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/69872907996.pdfIn PDF document text
    • http://robbes.nl/media/files/podevejoreserifomuxajenu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/66706778870.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/79559806457.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/93577737523.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/7340504358.pdfIn PDF document text
    • https://phnews.ro/files/file/93355442290.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/femewowolenefew.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jolugorulikisova.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/rezomugi.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/togajisazifesudisoboxa.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/rifigevuwimojenanafalojiv.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/57703609126.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/3195039797.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/75737057229.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/dinewugasujodulegez.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/jejasotevizugedubonujabom.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/fozifuroxolerudafozureb.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/wolofabedujin.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/57889935975.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/95358395777.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d41b5ee2a7408020d5fc30e1cafec199/kudakuzefa.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/57148030703.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zukapezovivebo.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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 14500 bytes
SHA-256: eb8c692cd761bce7f1aed0f243b9cd3038fe2c7d4a538947dfd3981b0a686447
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10596 bytes
SHA-256: 2799fdc1c039820178e4caceb9597543f8cae2e2dc00e409ca2cbe0b841135ef
font_02_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1