Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8c348b61eff745…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 16:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e830bde84be1ea7741f919ad297206b6 SHA-1: cab07b2a8c7b841afc2200c6af10f7730fc82600 SHA-256: ad8c348b61eff74536b9621524717d424cef855ca1209a136cb4c829accb4e73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts and embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://uzks.hr/upload/datoteke/56754422996.pdf In PDF document text
    • http://gpsputhuppally.com/userfiles/file/numejimetugelagupuj.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/jazegifigenapebuteb.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109162053017019.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/pajarujuwakawox.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/tetew.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/17894571527.pdfIn PDF document text
    • https://orangerun.re/photo/files/5885912302.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4171a31468e2aab1acf8c73af39b9615/47066278173.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/manusojirovevodejowulem.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/vekivuzutodojilav.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109221408238713.pdfIn PDF document text
    • http://pinxedien.net/upload/files/misokojopupuji.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/55706711129.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210914161856.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogelo.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/69591972360.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210909222752.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/popilezufapudisus.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/zinasejuda.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/3459991561.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/81344589027.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/sevilezilagesanewiweroxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+delete+cookies+on+my+androidPDF 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_off0000af96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A8 17740 bytes
SHA-256: 40a173a9aa89aa9661909e3ec220981e831af41cdd3e518acd8a761b62512534
font_02_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10816 bytes
SHA-256: 04ad8d073ec75145d22863e1e004cc96e631a41e7bf523f84ef900f7fd9cdd13