Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f22641e777925a3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 08:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f3689942fb347133988f9be0e256cb2b SHA-1: c367cf0d51d27a5f2bb3d747f40cd62f9dc542aa SHA-256: 0f22641e777925a3d437f72ce786f43f0e49abb07a31cf0f52c03e9c4e27d8d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=icloud+bypass+tool+checkra1n PDF link annotation
    • http://ombs.ru/uploads/files/6943988288.pdfIn PDF document text
    • https://electroagro.es/pub/files/bezinowunotojos.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/32400231688.pdfIn PDF document text
    • http://apicn.net/upload/files/zikas.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/2131010614.pdfIn PDF document text
    • https://euchebnici.com/img/file/puripaziti.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/45593315684.pdfIn PDF document text
    • http://learningkey.org/userfiles/34426630279.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/virifogat.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/91375275530.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/rotiwudivuruza.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/54760285175.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614880c8055df---92469745208.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594cbf05bf---bexagubaxapulemixewem.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/58832734355.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zikabowedev.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/ponid.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/saxumadixitavoxeza.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/4009581438.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/91441052921.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/kofewojovurozara.pdfIn PDF document text
    • https://fptica.ru/images/file/13835942311.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/gitivebumikopevotu.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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 20600 bytes
SHA-256: d93ad744f6489a2e0dce0329855df844b83b577616dc2b70a58917b83809da67
font_01_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 10968 bytes
SHA-256: 54e4fb2d207b024c3738c59d0f823d367bbf345d894110d3a9a5288ff980d676
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1