Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ac9eecdf375ac7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 15:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3f370190cc4043ed13ab345dbbbd31e SHA-1: e21f28d3e4499362bfa6ec7fd7bda27b6256ee65 SHA-256: e3ac9eecdf375ac7e1d619546adad0193a6cab0eba24310c034c0576742f03c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sangiorgioautoservizi.com/userfiles/files/3896549249.pdf In PDF document text
    • http://manhchenang.vn/webroot/img/files/42980020497.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/57521360244.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lewoguvepanetafawifexija.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/89234950957.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0c0f2f98---32955591943.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/49959747491.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/xaxoduvetedisigexudexo.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/mudakifomulor.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/48787973533.pdfIn PDF document text
    • http://prmakeup.com/Image/files/rototovevojolokosudifevu.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/43915604932.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fupolusatefalupuxase.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/26686892904.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/lazat.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/64668689210.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/jigukafu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/3884316128.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/55389795969.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/gobugajuzivapomuvegiz.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/83769613397.pdfIn PDF document text
    • http://sushi-belovo.ru/files/92459529283.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613b83cea3d90---xaferim.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fodoboxurudowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fish+tycoon+modPDF 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_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 19136 bytes
SHA-256: df4317f9d1204f819fca8b582fd75cfdb42e7f3ea10e77d4f0dde23577a8ef84
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10284 bytes
SHA-256: 4672ee374d6561304cb71fac39154ea14d858444d5bbbcf41a477cdb31fadac8