Malicious PDF — malware analysis report

Static analysis result for SHA-256 6059b34def3e8908…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 10:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e30fa44e08a9b123a31813439acfa3a1 SHA-1: a72e36161796d258176401ff8f109429bdf3873b SHA-256: 6059b34def3e890895c4998a4b26dba44e1c68eff5dc262f2fbe2a335b1b5109
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious external sites, consistent with phishing or malware distribution tactics. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vidaleve.net/ckfinder/userfiles/files/7722434841.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/zimirema.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/94301402784.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/65473716397.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/maluzumejutupulofo.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/88803004855.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/sonusanikalisiparidem.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/46096130271.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/dunipekumidurobuvalax.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/juloj.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/puravebadi.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912033119637252.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3pl618cm8j2d9asqkgd492pe8m/6687118796.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901060512_1wna5t.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130c7f0d6ebb---durivimuxabidizanon.pdfIn PDF document text
    • http://tercovci.cz/files/file/falokimipezevejugataxafab.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/98951468736.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/52573503528.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/37102135337.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/ruvobogomewowekupukaveg.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/46652393801.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/nejekanenekon.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/diwakopukovorisilitesizof.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/41112093894.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/26456002007.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903224815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=periodic+table+with+electron+configuration+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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 11060 bytes
SHA-256: 6dc35be742fa4ea803607da5f1bb094459a51ee31cee05dfb3573202010c00ba
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 17840 bytes
SHA-256: efb7f3b670e13654c59a397b4bad9ed7d6c518e5f8ed43b454de1ac38019d4d3