Malicious PDF — malware analysis report

Static analysis result for SHA-256 e295a9253478d2e8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 17:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 623c2732bb62d419004f3ade75c814b5 SHA-1: f70d86df6fddea375f3d33e0d1992ac353749a20 SHA-256: e295a9253478d2e8eca42b82198977f75d9601c2283a283e611ed223302cb42c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, which are designed to appear as legitimate files but lead to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+clear+history+in+play+store PDF link annotation
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/tumapiwajiwonikirasotikig.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/81096682906.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/29325866754.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109112116237986.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/16176164026.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/tanujulipofufuseserub.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b2830f21d76ebc9789c6aa219ceb3d71/77918036847.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nafuzolatomorawo.pdfIn PDF document text
    • https://12tiga.com/contents/files/40103073317.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/30754925302.pdfIn PDF document text
    • https://curvy.tw/upload/files/35457976357.pdfIn PDF document text
    • https://aashianarealty.com/file/8819330266.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wuvozibekigunubagez.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/xetofeviniwaneriwuvulag.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/25295128685.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/76165084614.pdfIn PDF document text
    • http://polipack.ru/content/file/54732882944.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/xufanixo.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/xixej.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/73886973836.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/12643755887.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/razugejodojowisazunud.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/73859626342.pdfIn PDF document text
    • http://ahknchem.com/upload/files/67598732856.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/78728112041.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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 19032 bytes
SHA-256: 1cffc6f0ef5eb7a446099d9ba244aa4d12f468acf9a49c9a42e44bdf9d0e66ec
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 10660 bytes
SHA-256: 58796355deb13d7c1c982dc54bae1afe0b5b528f4a937aca547b2cd183203cd1