Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea99ccb0486b75f0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 18:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c12fe5e924e5d03c7f67ebed8a3c272 SHA-1: 57c7d8bb5d3ee0e13d5c7b7566654397e8afe457 SHA-256: ea99ccb0486b75f0064fd57046b7a840383dcb683820e28d5c486efaf1428f21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedb0efb6d---37864672109.pdf In PDF document text
    • http://tehla.eu/userfiles/file/vojoxagefelelepafisujobaj.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/80888975081.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/96864996111.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/janimogeragapefubupor.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/fudafeselesewonorolakap.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/6327156068.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/boturofu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/monil.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/tiluwipeviguvusiw.pdfIn PDF document text
    • http://potlista.com/file/files/62758632104.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/69583042121.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/14945550097.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/nozovumigeremira.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/37241025904.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/20090466703.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/79211553279.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/66345599178.pdfIn PDF document text
    • http://plncse.hu/php_data/file/44753941800.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vapumijefid.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/remuvoxizalesagitufijug.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/23070613712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=valentine+one+user+manualPDF 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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10340 bytes
SHA-256: 35dea3b7f5579d2cd99d32ccac9eb9a429af07a3a8f91fd137b0ed417f629e4b
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 18096 bytes
SHA-256: c3327019a3489141635d73ef409bd560b592767de886079347a08e24464488ed

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