Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b8c45a751d780a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 13:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3377aad559d3beac1942f4f48ce3efe0 SHA-1: e9533fa3a38681134d2064433ad7309e635b0e95 SHA-256: 41b8c45a751d780a81efbbebc1dae3c0a75a9bb413f306fc325c66e60f6c3a5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to various PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the structure and embedded links are indicative of a malicious document aiming to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.orthovision-lublin.pl/ckfinder/userfiles/files/33973709442.pdf In PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/87729781348.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613663eb21cd7---75366511758.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kevotojakunogegusel.pdfIn PDF document text
    • https://o-dance.com/upload/files/23299508332.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/35321349265.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/41330667940.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/jegobemobatikiked.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/75972156720.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/33929359671.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///69703003131.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nodeze.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tovibalu.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/47877961459.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/luwukidizawirawuvoxitaxo.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/19315650322.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/13484192376.pdfIn PDF document text
    • http://glassick.com/userfiles/file/28375240324.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/6699391452.pdfIn PDF document text
    • https://tarsiman.ee/files/file/66080101325.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/nokubogiwatipid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+gta+4+apk+dataPDF link annotation
    • 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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 17420 bytes
SHA-256: f17cfe5c18d6d1c8d32bbd74605b1ba534121254e56104979fbe0dccf68cced1
font_02_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 10332 bytes
SHA-256: c29d7956a341be02462d8888fcf1f3dae3f017d16631c820a4e0fe5683c90615

Open this report in the interactive analyzer, or submit your own file for analysis.