Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0435f2050a10f1a…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 09:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c08bde2b56e6a275db356ba551cbb27f SHA-1: 5dfebf12085d49562c67f14919b4bd45ff31e738 SHA-256: a0435f2050a10f1a05e014cdee3478834d67e404ed13b0762ba846c4dbc8d38f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

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 https://bawauang.com/contents/files/85324001036.pdf In PDF document text
    • https://gmnavarra.es/ckeditor/files/zazodorufutigedalopati.pdfIn PDF document text
    • http://dnepropress.net/files/file/godipufin.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/58017421941.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/70360229921.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/lijupuwuz.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/jeziwoxagom.pdfIn PDF document text
    • https://robodom.si/files_vsebine/bapofof.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/ruxezi.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/xuratav.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/25850408851.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/badadowin.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/60186814500.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/79871243397.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/91317007452.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/jerilatafiwame.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/89412566956.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/50758405699.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/86136774856.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/subafi.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geluduxaga.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/dafunojezizulejiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+bondwoman%27s+narrative+free+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_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 19160 bytes
SHA-256: 8fb5590c9aa67a7762dd7a67c787ff56baa088c916668dfc1baee9934bff82c6
font_02_sfnt_off00014638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14638 11008 bytes
SHA-256: 7e09c8b91eb5ceeb022ab14c14fd23e42f8bfb00346868cb4e8b2e5a13ca1f30

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