Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d01efdbe5662f0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 07:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e5fbec18bff46fd92176180a3981eb0 SHA-1: 073131b931815c400e123615390d3fa07818f91a SHA-256: 66d01efdbe5662f0046a3934f778d3761716defc56f7efd0fa0c215af85750fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atiksigorta.com/files/tukumudabejinomomokotugas.pdf In PDF document text
    • https://vibingvibes.com/userfiles/files/viwifinoberupiwuriwexunig.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/puxawizolemafonefew.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dimemazonopewez.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/87023886184.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/81405123346.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/93681884664.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/lufivevojulijitaz.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/tanaseviniwon.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/mizaka.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/64808143474.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec5f45525---zigukenezufuwikutunavi.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/lexufifulavatemafiz.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/2719484246.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/girobafiguxiguwokepawez.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/11436951999.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac8be5d0eabe6dc465f88f371a6bc90c/jexikalekaxesip.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/dotikizakosopewus.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/46261882867.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/67871260818.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vesakixogetebejosun.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69500064278.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/golakadasorepejaniva.pdfIn PDF document text
    • http://mariancozma.com/_user/file/nimosikuw.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/wofet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+hack+injustice+gods+among+us+androidPDF 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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 17432 bytes
SHA-256: 0c3da2f47d026392f4463277212a49ebb5c6078f3a4675e77e230fc5b3f888a5
font_01_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 11172 bytes
SHA-256: f2ebe71153291885e598065b89ebe9b2da6eb051e48a4f2bbc07ee957c773fee
font_02_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1