Malicious PDF — malware analysis report

Static analysis result for SHA-256 c982cb1a7e896a32…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 22:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a40dd5e1a880126c10edf419bf2f73fe SHA-1: 7ab4da87d85f7f1b2ba5d126748a03a321393cce SHA-256: c982cb1a7e896a32629a833ad3197482ff40e9cdf3407ba76288b703fb9121a9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://bloemenwinkelindex.nl/images/uploads/nizaxi.pdf In PDF document text
    • http://adriennemason.com/assets/files/dumamar.pdfIn PDF document text
    • http://mq-water.net/upload/jeluberorukibakunebafo.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/davupisavatiwijexijemezal.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8b9bda486---gowemojejurametomav.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/zesobi.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/74538418388.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/ruramojolakotapiwowiguzaj.pdfIn PDF document text
    • https://jensbrode.de/files/file/nijupimefet.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/nugekinajevojobev.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/32969314028.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/31295484550.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/tekimin.pdfIn PDF document text
    • https://hobbypet.cz/files/file/junakekobajovewozafibibed.pdfIn PDF document text
    • http://rafaelokazakov.com/file/52270484362.pdfIn PDF document text
    • http://wamer.org/userfiles/file/77355040003.pdfIn PDF document text
    • http://chinahongji.com/d/files/14806402632.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/50380707394.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614449c15c55d---migit.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/4106086632.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/buvatesezomobisoripumiwu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61484287180.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/98580518058.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wenuwezibowokuga.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kotuxupiteni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=a+court+of+frost+and+starlight+pdfPDF 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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10848 bytes
SHA-256: f0703497ae8297c276665c5a25cb42c68130ce5b4ef66898eb86d8b7884ab33f
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 17944 bytes
SHA-256: 2c099b197b6356470b367ec8cf6760a09223cebac6f23da99220f6d28657dc0a
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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