Malicious PDF — malware analysis report

Static analysis result for SHA-256 c352a3266031daf8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-27 07:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ece85c8064dbcc29eeaddf9bb6c82335 SHA-1: c1c7a154bf320c51bc34931c210db78209804138 SHA-256: c352a3266031daf8cbdac234418e6ede5d3a583a3451e77f649caad76838eb39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://www.taxivanclass.com/uploads/ckfinder/files/nosoronirixazawofimunujuv.pdf In PDF document text
    • http://cn-biyoute.com/d/files/39600035555.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/zovajuzebiseramamamezuko.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/90431903862.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/44234327932.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/1560401927.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363495262ec---fukekib.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109161436363748.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///25051852941.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/70309436599.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/kosalizifutozojopevex.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/49632974320.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/nawovazibajefazukefobel.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/makafesopigujawubipupup.pdfIn PDF document text
    • http://chapelguild.com/images/usr/timozudibawedaru.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783fa137b2---70587584985.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/lefaxulufibutisinijez.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/pudezaxejubusi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/45114722215.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/pupulalagopibiwawo.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/zemolap.pdfIn PDF document text
    • http://blgjad.com/upload/files/kikasasijevizibotuv.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/nusopanajifakofij.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/10536834853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=partituras+para+banda+pdfPDF 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_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 10436 bytes
SHA-256: b86ee555a41c7f8a926da002bf086090ccf0e1016bf5081da7bbd2c308a765ec
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 19320 bytes
SHA-256: 963a9cde39a63b0635159ea60317f4aaf5e099be541d8e3f13278da5015edb23
font_02_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1