Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc70ab77da4058c8…

MALICIOUS

PDF

69.0 KB Created: 2021-09-20 11:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a11bfc92721b7b0d92d6ca3c9dd8290 SHA-1: c409a83659a651ba8480232cf6bd1cb99b489ded SHA-256: fc70ab77da4058c87a89f6f04b3d2cadc7b692be604d536799ae21fc78f3ac7d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The PDF structure and embedded URLs suggest it is used as a lure to redirect users to phishing or malware distribution sites, likely employing social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=friday+night+funkin+online+game+android PDF link annotation
    • https://bokaichenyu.com/upload/files/pilokolefu.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/25849475614.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pobapesa.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/57871203628.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/15906704557.pdfIn PDF document text
    • https://guijek.com/userfiles/file/17936417776.pdfIn PDF document text
    • https://mlspoland.co/files/file/94478613671.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/visowerem.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zetife.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/zategebawufonavapi.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/69146935804.pdfIn PDF document text
    • https://people11people.com/uploads/File/barokuvodelitagorazinuji.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161483fe264f77---wavepusitexewidu.pdfIn PDF document text
    • http://retailcop.ca/files/10510865007.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/95080694596.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/jibakeg.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/29109471854.pdfIn PDF document text
    • http://labradory.pl/file/52252590694.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/81337965673.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/79371005775.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/7943767918.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/97466957800.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/jinofogewane.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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 14416 bytes
SHA-256: 54caa4f6afb74cea4d9e7b7aa49691ee177da8d5159b73e7075a5a48c7434091
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10916 bytes
SHA-256: d069451ea33fa7ac9b923bf97ba53bee2365f4c71e51ea40f67faee911ff86b4

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