Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21a246c73f843b0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 08:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f51d715008ef81f32490aed231fb042 SHA-1: 0caa4d330921b5b14b12dc6b1e5c49999ee1661a SHA-256: a21a246c73f843b064c606d28783bdcd5ccfa7ffacc533711ee0a3441703475c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ptkas.com/kingkong/userfiles/files/90489692033.pdf In PDF document text
    • http://votejoedestefano.com/editorData/file/88079893823.pdfIn PDF document text
    • https://ibericadearmerias.com/file/zunotoledakobowupota.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/masevokarinefudekuniwiz.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/sedepupiforoniwalukuxexi.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/42548312377.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac3d86ff5---fotavu.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tizotipa.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/52648913178.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/64832682719.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/98204459303.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/lesazinigiterenagat.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/49461203634.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/gosozogarifudusud.pdfIn PDF document text
    • http://chinazzjx.com/d/files/111310202.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c6344ffac8310202c7d10385195291e9/sijewisufuwow.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/bimiresigumomom.pdfIn PDF document text
    • http://taociren.com/upload/file/210913182629961002t66a089mmfc6.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/92552312567.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/47514380154.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/99019471674.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/4034567090.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/tamepusamizinojiwofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ezpdf+reader+macPDF 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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 10196 bytes
SHA-256: 5b1b24c50d3385a0ac7a1a0eda12583a2fe282aa6df07578a11a663def543c16
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 17920 bytes
SHA-256: 5bf822dd079e1e262bd53aa4f9b21451f7efda4296fc5457223bb73dcd694356
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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