Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68fc9e6e3c7e31…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 08:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82e1d2909fdd85c9e98e0e2176055190 SHA-1: ccf31baf0f1edc5968909b37451e17de94644db9 SHA-256: ef68fc9e6e3c7e314412edae338ffb9d82be8d5b0d3b5e70c3a6ba4bf1db6a7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to external sites, many of which are part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=where+does+deleted+photos+go+in+android PDF link annotation
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/netovadedosareri.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/53651247691.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vanusiwobepebu.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/bipitipewegusase.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/39033675359.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/24805344694.pdfIn PDF document text
    • http://futboltotal.net/images/files/12176321801.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/39433316785.pdfIn PDF document text
    • https://synersys.fr/contenu/file/52006028933.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/danatolatisotobelo.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/dugebinonux.pdfIn PDF document text
    • http://le383.com/uploads/files/44052050656.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/vemosaxufi.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/rareforonila.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/36167611d9ce10fd7fbe6138aa7d8bf1/41762750519.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/77486970183.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/zoguxajofufiniza.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/lafudewoserekifaxe.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/butituzuxuxupitivedo.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/sozisusupasezituki.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gejukubilagerarom.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/detujolusimekesuserisut.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/73382726859.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/67650980049.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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 18024 bytes
SHA-256: cce524cce5640fb4c3fb528450670489927e7229253c9cc3b5fbcef24206fa35
font_02_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10664 bytes
SHA-256: 1f0872efa5b1d8ecbe54dd6877b504b930b1c03ea7bb0446a9a78e2795ae1f79