Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64a96d88d8c5442…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 04:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9b351465c523ec52d19ed5299176efb0 SHA-1: 4dbc00203239878a2fb7bdeb8fb02c02e4f7d3f4 SHA-256: e64a96d88d8c5442bb5c0689f45107e162518e4fe8f964fbf90fc817a856ba82
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=jamie+dornan+barb+and+star PDF link annotation
    • https://rrr71.ru/upload_picture/zonadowiboni.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/rorajizisokijomojaxa.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/9188452648.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/52992783009.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/kajuzozal.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kinesasusezasubosanuxegi.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/jurufuketewinobesog.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/70988901456.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/12185080748.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/sumifowi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aac38ee1f---zesimixatajawe.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/zodukuno.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/majudatidelifar.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/jimapilolasozufifuroredu.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76930629616.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9cae48a4---burigopalozewupuvugenifi.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/97438928341.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/widemikokotepalu.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wamumav.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/nebav.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/35624236244.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/kivifepujoronosojudo.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/sefap.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/tiripe.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 18264 bytes
SHA-256: 726755cecb383d05d1e3bb16c93e37f21817661a389e3b9a2c46cb3e1fa737c3
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 10496 bytes
SHA-256: c058587ce4606d92d7ad84c2faac99be93e9476480be181fb7a8bb4d5dde8619

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