Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8fc7bdb9e6cde0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 23:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 786aae30a45211542541d4419f72804e SHA-1: 4b2d488e23a39ccab5224005e8097b55c01ee90f SHA-256: eb8fc7bdb9e6cde0652ce92518cec463d34fb9a1cb642f4d86a22fbc592ca137
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=world+most+downloaded+app+on+play+store PDF link annotation
    • https://cafemocion.com/userfiles/file/lavovozonafazubepegenigu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb151dc6---49113470685.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/2861342664.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/61739873778.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/19149571956.pdfIn PDF document text
    • http://novafish.it/userfiles/files/99506500257.pdfIn PDF document text
    • http://myredm.ru/uploads/file/tutimab.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kosuvunivalubalugatigudod.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/pipusimaxupe.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/84765460907.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/28288273188.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/40883433176.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/50062140659.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/temamisax.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/44579440909.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/safosev.pdfIn PDF document text
    • http://popeyebio.com/upload/files/jobomu.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nedubemapagajawisiledura.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/41842178013.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34911947187.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/37d66a75f9e11e2dd3d1f4c74c6f9a91/tusunenuxejib.pdfIn PDF document text
    • http://ecole.ru/text/images/file/83298733378.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/80565523651.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/98963174212.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 17432 bytes
SHA-256: 241e9a0b4fb083901c936f334995d410947ae4f5fbfc208e2404766afbb214c8
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 10656 bytes
SHA-256: bdb0709ddf20d9dd4bb9dcdd58af523fc6811e0cff076bbbf9eed8d9128ac04c

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