Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da81a798f994d4e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4cf836141c7fbe6eb7c7e865a21b255 SHA-1: fa3ec874f2da1de09175e54d29b24039601b4f6f SHA-256: 7da81a798f994d4eb3105621bd686cc92c28eee5ed82fbe85144351ad099033c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to malicious sites.

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://pixomot.ru/uplcv?utm_term=wlan+test+app+android PDF link annotation
    • https://nepalihemp.com/ckfinder/userfiles/files/rojibupigabe.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/20479742597.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/6240560538.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/80618822013.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/vajirepilugojanaloj.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/14933373385.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/32828584142.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/40754598364.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/tizeluboz.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/27267081518.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/dadapitujubupuzobebut.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/2431623585.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f1ddc988---66562364030.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161392b53c5b7f---82387458009.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/koxuxaxebedilimamonuf.pdfIn PDF document text
    • http://meuseguro.top/fotosempresa/files/74267835786.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vakozexixafa.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/lodemoso.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/67244599016.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/24397045760.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2eb6ce5f6edc7b47ab605b664b96c7a6/58613697862.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/lifamek.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xudagov.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/4418226312.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_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 17180 bytes
SHA-256: 4a630a6f7ec5584edb6554321532b26486b010548f5c12f3283f3ddc7b2ab901
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 10380 bytes
SHA-256: 9a04da22255e4c1fb0bdcca846faf725b4ab678a615fc3ac9eb6e6f345a0c2c9