Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4de6e705e183f3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-24 09:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c30ce8bd5a8783802c86f73897408e21 SHA-1: e863de977d538b7b4f70b4db34d96c32a617ef0e SHA-256: df4de6e705e183f3950176db45e50baeb9928fec6ec994cb9a48bf432a80810b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of multiple external URIs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=how+do+i+get+the+shotgun+in+resident+evil+biohazard PDF link annotation
    • http://er-trans.com/img/produkty/files/logapak.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6j0574f31es7nkqoujsq3e0anj/garasep.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/kumerepovatawanino.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jelapotabobiwapidakizekuk.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/48781195359.pdfIn PDF document text
    • https://angkagenap.com/contents/files/17625941547.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/34670034730.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/24284134202.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/bexixexediselaf.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614113967498a---pilobenoleper.pdfIn PDF document text
    • https://naves.cz/res/file/wafugebaxi.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/24985424502.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/razepawofivexunojolo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/lapozakenowibupaven.pdfIn PDF document text
    • http://reopen911.info/media/file/83257922694.pdfIn PDF document text
    • http://julianina.de/upload/file/19853871434.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/dijetuxalekuxeliwomofirat.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74559533039.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/25401401026.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/gojepejapamute.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/98444334087.pdfIn PDF document text
    • https://tigapilar.com/upload/files/82992043538.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/fudekuxifaxowazegu.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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 16744 bytes
SHA-256: 273dca5a6f5e32f9a72fee15fe77cfd5f78ec8af32cf22a56e73667f851410d8
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10972 bytes
SHA-256: 0778dc78de06cd8198bf30ffc1b0dd16a17f1d650a4fa753660d9667a92927d1
font_02_sfnt_off000102d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1