Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8a02b035196415…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 06:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8eba80b4d9d509ca7e8e2a83ce97038c SHA-1: 69249a600f873b0b70e842d23f7869f638ee23a0 SHA-256: 0b8a02b035196415933019577381c2cc8d13760842bdcd7a5cdac87d8eae5808
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unique URLs suggest the document is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its direct purpose beyond the link farm activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kolbiko.com/images/uploads/file/sazagebotix.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54075321520.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/12300837892.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e8211958---39565470780.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/1012022542.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613483302f52f---borodoxiwumi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/75341937239.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/retuwatoxovidadeninu.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/70015304879.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vuzavonula.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901050252.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/70835381169.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/16431398244.pdfIn PDF document text
    • http://intersonik.eu/upload/files/14197403340.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/bexikusisop.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/topen.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vagosonisuzanovikire.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gojutomimifixirij.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/15004618472.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/1849626700.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/28257370415.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/masijufileruk.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/56889760611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=apptrailers+app+downloadPDF 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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 10452 bytes
SHA-256: 327dd04bfea82819f59f7d2a15bd2912f486ae44e4bf7e39b2f7449a9dd42078
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 18052 bytes
SHA-256: 2a5c55ebfc76522640095664d241de95043eed77efd98a4b08efa72aa16148b1

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