Malicious PDF — malware analysis report

Static analysis result for SHA-256 10179fd3a33fe00d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 22:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 93391e5f23178a320ca65ed56021b87d SHA-1: b258bf77251306e90ce1fe8609a83eea3c62b333 SHA-256: 10179fd3a33fe00d0143cb3fad638e7af6f851f1764b55b985c8c81b8dc7b74d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs pointing to external sites, suggesting a link farm or redirection mechanism to deliver malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kocavietnam.com/upload/files/ditozofefavaloba.pdf In PDF document text
    • http://i-physiology.ru/upload/kazizeji.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/69503175243.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tufojemigema.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/tuginemikozun.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/wilojuribiferatadu.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/44427251588.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69437226711.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/33795202845.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/mipigag.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/94817756037.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/54057943663.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/zamekakadazab.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/midabunorozekitof.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xesadujimogiwaxufemu.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/dirutiviwepikejiwi.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/kuwug.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/wuwosijukesepuvapagu.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/puvivixozapimizo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zanijeka.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210906050022.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/39290028118.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/50701500607.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/10509775789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+screenshot+something+on+your+phonePDF 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_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 18564 bytes
SHA-256: 6b82ad2804cd9776c7dbb5f9333039f7cfa27b19ef245644f869876b96a8c6e3
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 11044 bytes
SHA-256: e88c14d216412dba61cdb1663d85b23073ed6863dac1fca5e0d5e55562dc3b5f
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1