Malicious PDF — malware analysis report

Static analysis result for SHA-256 514aacba0e677f06…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 05:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5a4b089a0178e8512cf428d6e15c28f4 SHA-1: f07a629732814739c30718d8655ca9a78f2a64de SHA-256: 514aacba0e677f06318e1d66618ff17679c1f82dd4e2c59ff3d72df680731621
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates that these links are likely part of a link farm strategy, with many distinct hosts and a low number of links per host. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pi-consulting.ch/download/xagiwotomokub.pdf In PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/fagunofibilosikifilu.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/57470108036.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/65665365059.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/xaradifinedurex.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/voxupiworajinebawebaku.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/15171417293.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_232525.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/nuwojulubesuvo.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/fadewaput.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/sakuburirurawonejosoluba.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/gawidekulemimililevutal.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/pogezozurojokupefikuzeluj.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/73805319810.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/jawavolasefade.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/12829128938.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dofelobinawidure.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tafolemebuvad.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c66c16c8d---dalovogamezagijenunisuf.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366e43b4219---91739768074.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/vijirota.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210901175527.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralokibazafut.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jonapuzejibugif.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/85440285586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=top+10+pdf+reader+for+pcPDF 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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 10240 bytes
SHA-256: b23c8c3143133060b98773e235b2af9aacf865045f0b0abea5425c4414b089bf
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 17508 bytes
SHA-256: 9baf5b98e72cc5ebb2b015d80f88342338b5406f00e6fcd6d266b6ea955ec07e