Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea40f03a218cbb0…

MALICIOUS

PDF

81.4 KB Created: 2021-10-06 21:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2dd0a38fcef54594644769951d53d70e SHA-1: bd7b1aae1c18fc690e64ea1a10c3506226f72c3e SHA-256: fea40f03a218cbb0a142792f204287a3ed0f33c6c5b86b1526e6cbddeef9e296
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this pattern. While no scripts were extracted, the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://psychologadamczak.pl/userfiles/file/zoxenaxevezewupeve.pdf In PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/97363569462.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/060920404039.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/xunilo.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/34690208757.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/11756607247.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/43280552520.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad1737bf08---madebikunaditufak.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/27558256834.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/pamokajijuberube.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/sibunesira.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904065940750064.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907033215.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/61164173214.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/55967944700.pdfIn PDF document text
    • http://cobmedia.hu/include/3517722873.pdfIn PDF document text
    • http://olympusflights.com/files/files/jupuxupetewovavidunekop.pdfIn PDF document text
    • https://kvzriu.org/images/file/mewiji.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/vunami.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/faxalow.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6cfefc61---36599854155.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/2372551973.pdfIn PDF document text
    • http://yuli-china.ru/d/files/vununeraxo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/17176786139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=brave+new+world+chapter+8+questions+and+answersPDF 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_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 20012 bytes
SHA-256: 499f489e48a74c9fb7ed93aeee2a56738e4cc4e46e7c7b67b9ed4595a45f577c
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 11268 bytes
SHA-256: 5ab73ae2e8eb4575b9f5e12d076e67f1372f7a75a0217db9251ea52c2c9ca4f7