Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf41d0e78c331cb2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 17:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc6c9567c27c884c923bf39cbd419e9a SHA-1: d51eb2fda58caffad1d2741fd48b4f8430fab97f SHA-256: bf41d0e78c331cb2ebd4071e0ffe2167064726af41cf8289aebb5cbeb71ac4d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm, suggesting a phishing or credential harvesting attempt. The presence of embedded JavaScript points to potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://tutorlookup.com/ckeditor/ckfinder/userfiles/files/ruwisizararuveditilokuki.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/80753922904.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/bizifadexisupuru.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/joxawoxejo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a19c8b758---rubinekuze.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/wimova.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/goxelemeru.pdfIn PDF document text
    • https://andhimazhai.com/images/files/panasimawumuvasilemigo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/poletaj.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ajdh0ie2r4a9mupjm7gm6jknr8/31614660107.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/26929519671.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/54522534113.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/55974987999.pdfIn PDF document text
    • https://korankertas.com/contents/files/petewarut.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/finuzuzelexezexelododi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/neputigorazur.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/foxejag.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79537224182.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/resemarunagavufizipageki.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/juvusetif.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/2384985145.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/45223908544.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/38659081154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=boxing+tonight+live+stream+freePDF 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 10884 bytes
SHA-256: a56272766d941633a9c0ebfc5b567852af1b1cfb24147a22195e220b037214c3
font_02_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 17476 bytes
SHA-256: a25df2ddd03dab29864b29ea1a8d954202179932377376a9a46e7012df6f4824