Malicious PDF — malware analysis report

Static analysis result for SHA-256 55443e071925f248…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 20:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c9e0a31314157ce725be3e5678049ae3 SHA-1: 5a6a90a2afa1bceab2c4f5bacf528b26d4b7391b SHA-256: 55443e071925f2481e36fa449b0cf8debd70c7940f854d7e8714ffa5c311d6a5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with a clickable action designed to trick users into visiting an external URL. Numerous URLs were extracted, many hosted on potentially disposable domains, suggesting a link farm or redirection infrastructure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/84210980736.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rtjtcq4vpj7v6pj7qeu3ue73h7/64400425370.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613561a3ee95e---vadepipog.pdfIn PDF document text
    • https://allianztc.ro/files/file/vapetoselubowerifijus.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/merabepoxigijeterawak.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/janiwiwi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/marutumelogiperuxuvazi.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/wefokimuvezubot.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/5139795819.pdfIn PDF document text
    • http://deltools.com/userfiles/file/58839178322.pdfIn PDF document text
    • https://norservis.com/files/files/12840170879.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/39912616425.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/2102566500.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/87150083800.pdfIn PDF document text
    • https://gtpoznan.pl/cms/files/file/pajojavozuzufejaduserur.pdfIn PDF document text
    • http://abnicum.ru/files/file/sowexofexuniwojag.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/kireru.pdfIn PDF document text
    • http://sbkf.org/files/files/jozuvulonolekovixuzodo.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/23019046824.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/kivisujapidefirumul.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/82814608603.pdfIn PDF document text
    • http://findusafranchise.com/files/files/wiziwijelutakesos.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/92643528225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=turn+off+live+caption+pixel+3aPDF 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_off0000b01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01F 13868 bytes
SHA-256: 024bc9131a92dcc7b85202862cbb933f506d95e31b983e5e9e721a7e3d391162
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 10708 bytes
SHA-256: 2a7598da13075e6f5255b07d92c2dc5ede3f64f8e5b46c9db978cb59bd53c136