Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa96c0bf2929ae70…

MALICIOUS

PDF

97.2 KB Created: 2021-09-20 13:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7fba950dfbd16aa7bc739352b31d469 SHA-1: dbbc929ae3ef909202bd62501b26a2857e67fa66 SHA-256: aa96c0bf2929ae70b3e950f40a8bcd3f749aa5601190ba20a5380bc1d72d3908
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one specifically identified as a potential redirector. The presence of embedded URLs and the structure of the PDF suggest it is designed to lure users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://medvor.ru/uplcv?utm_term=global+winds+worksheet+answers PDF link annotation
    • http://unitec-egypt.net/userfiles/file/39619796402.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/fawujewuxubefuzikedare.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/90494655991.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/12010147242.pdfIn PDF document text
    • http://castel.lu/userfiles/files/96943765642.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/nudalawaxopetutik.pdfIn PDF document text
    • http://headrepublic.pl/images/files/vilamuwirikumemuraba.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nogutemakolibubiga.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/nivogubexulotusevab.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/2000380201.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/70610836978.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/punukelo.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/19018067286.pdfIn PDF document text
    • http://martonelektro.hu/files/file/56492886789.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/zenarojovadodugi.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/jiwimej.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/209c7bddfe67edb98ac7b77d552c9c32/xowuje.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bozitixa.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/54568223213.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/45087225961.pdfIn PDF document text
    • http://lobi.md/userfiles/file/fenimuj.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/surenug.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/25178285838.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/67177606560.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/42873007075.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410d8acf3d6---dotelabekusatogoves.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/20334535765.pdfIn PDF document text
    • 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_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 10700 bytes
SHA-256: a7db17a2e4110908dee64b1a5e6d7b91ba28d002f835afc470ec7841c41b9168
font_02_sfnt_off000145d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D7 18608 bytes
SHA-256: e13fcce8855b133e1f1db75452d408d983ef4c1550c5feefc356323e225e247c