Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd55eb354c3ac3b6…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 01:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 308a38fa92ccbfbe8539a564bdf8c7f0 SHA-1: 110008fdaa8bc719182b569432678f871741f146 SHA-256: dd55eb354c3ac3b6092b18ddf2a65c9a56fb406b3a6789646faadabae3a0a4b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect the user to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://hbphoto.ca/resimler/files/janonakalulukurumigud.pdf In PDF document text
    • http://www.polni.si/Images/files/jamusi.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/jezatukumakezuzuz.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/79743288884.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/gexubabonozurek.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/70291305887.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/97540669115.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3dd8e013---dovubogidosalebu.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/pagafitopixog.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/82928403948.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/paxadezavixijunapetepa.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/sazemamujijumusepovuz.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/fefipunadakir.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/89451330098.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tejatugajiguwewibij.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/95406627503.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/zajisonedomujik.pdfIn PDF document text
    • http://pvvc.cz/files/13584053032.pdfIn PDF document text
    • http://polipack.ru/content/file/posel.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/49483078064.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/6292440373.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/24187211174.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/79684e1ae3aca758298ca610291b0e68/xubepugowodatibebosibadex.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/rutebe.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/3533534371.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/83634862787.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210905065004.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/23946305435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+turn+off+call+forwarding+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_off0000c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10528 bytes
SHA-256: 681b34d8e7e188421267b4f3301c5ab47beb4ee2818c1f79b4665f79b753fa3f
font_02_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 17688 bytes
SHA-256: 85ccca1139c1fdff74a74729e2fd01e651ef21d0c3431d486e2c49474cbbfe56