Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61d194640fef71f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-09 22:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5121d7abdcac63b3d03985c1c58a5847 SHA-1: 65809793165badc88bccd9784586821ddb3639c4 SHA-256: d61d194640fef71f73f38d1a0f499e9463308969c17d4897cd2d807229371501
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate it's intended to direct users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nataliashishkina.com/userfiles/file/74860477098.pdf In PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/48137238619.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/nexezesufikifep.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/zudew.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/giwofinilizafopaxax.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/85419539702.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/57195940694.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/64166766823.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/86377680917.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/53940583354.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/sizepuwalamewa.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/25563213811.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/50835831124.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/5581546903.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/39836167309.pdfIn PDF document text
    • http://konberdbio.com/upload/files/jerotadifipuvuxab.pdfIn PDF document text
    • http://beta-rc.com/upload/files/wekagi.pdfIn PDF document text
    • http://cabini.it/userfiles/files/50943205367.pdfIn PDF document text
    • http://ombs.ru/uploads/files/73710942078.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_6739EEDF7A437468.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137294b8bb98---mumafosezatimewaz.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tidesobidozoxizodo.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/63052244983.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/gazeduxupakexosaxu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b8de2e18f4f61d9d86808871f5f5da5b/navemarebew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+multiplayer+apps+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_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 17248 bytes
SHA-256: 42bdab1c12820924106a4126f729e7638067518613cb466f269f33c97f535887
font_01_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 10820 bytes
SHA-256: ce93777a767d78e85d9858d8c3b3e6860bb57c8799d38e83c7d79273a5fca12b
font_02_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1