Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f19af7c8f65500…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 15:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5e4f6e58c9f796f0cd9dcc0982b9193a SHA-1: d5c25b156bfb0159cee81f8f52eaababb30d5607 SHA-256: 20f19af7c8f655007f179ea9fde8f27bcd27374de0dfc70aec8e3eec9a120b36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of JavaScript points to an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sharmtocairo.com/userfiles/files/juregumasepimufikofer.pdf In PDF document text
    • http://erfansari.ir/ckeditor/files/files/77365649454.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/pesosixalawoniruvukawe.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/54459705769.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/82632249097.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/vunopedunefegosawadu.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/35156230387.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/54812827422.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/25349672435.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q16cg64ti8isslqtl6sh3b0st4/87389062388.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/doken.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/nusixunekujule.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/nepeburikuvazox.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/suzosadidavotajovafitada.pdfIn PDF document text
    • https://codecs.ro/images/file/tarewalitigikajini.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/merunokijupufolinujiz.pdfIn PDF document text
    • https://austarpharma.com/upload/files/84554803411.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/31619640873.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/63534702959.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/perisugenobaxelijamedinez.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nugexaninovofige.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/16479883850.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1ffbfefe---14662584633.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/fasejakides.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/lixofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=asphalt+3+apk+downloadPDF 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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 15204 bytes
SHA-256: fa2e9fcb487111b9a4623ce4e95c1bde8ff494abe449004d013ea4ea530e4190
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10496 bytes
SHA-256: 3dfec416abbcd90f01dab861f81f75aae6571b4d0a295a97a15ae54d6ee68cfa
font_02_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1