Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bd844c181fe13e…

MALICIOUS

PDF

97.0 KB Created: 2021-09-16 14:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6304c15c7b2365528e9d1a063bcb4f30 SHA-1: e269b0c4289ba721cc23c7d46cfd7ba81f137d80 SHA-256: 05bd844c181fe13ec459888d061c84755d8f04ba28c2eb5209deadd2fc02b671
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many with 'utm_term' parameters suggesting tracking or redirection, points towards a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://krisoc.ru/uplcv?utm_term=gta+san+andreas+mobile+download+2020 PDF link annotation
    • http://email-database.info/userfiles/file/53897067340.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/84507270485.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qhkm6fgumddi5d7g9nnogoss6p/kefoniba.pdfIn PDF document text
    • http://e-district.org/userfiles/file/lamisozedonirigodi.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/80333051198.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/92312157163.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/5455793562.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/65832867150.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/24070848079.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/73261297897.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/1150294020.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/mugugaveporilubawoz.pdfIn PDF document text
    • https://limsurempat.com/contents/files/vujesojozowibubovo.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/jisuzo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613debd1ef540---gavagib.pdfIn PDF document text
    • http://chikatere.com/Upload/files/tadodew.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/diduzifofamawa.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/84116454252.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/lobivelepus.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/15604368659.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/pafuridarurixosit.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/kupadofijemeruniromubo.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/85941470531.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/60952154743.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/79951639682.pdfIn PDF document text
    • https://hsse.cl/files/redorasod.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/66179368564.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_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 19152 bytes
SHA-256: 78d2af7050e9a6b0dc7bb2d8cee343c47a5d1a33d847a2313918688b5bb9a635
font_02_sfnt_off00015c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C79 10916 bytes
SHA-256: bcf44a78da5fa2cdaeb1a72a7429f9760eed37a7a80d965090e8b93ac85cd526