Malicious PDF — malware analysis report

Static analysis result for SHA-256 61aed9665ba3227e…

MALICIOUS

PDF

67.6 KB Created: 2021-09-09 04:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26174175535235733aff9e3d0fdbbd3b SHA-1: 791937bb7d81717dec4b9934b5edf3b3cd060a34 SHA-256: 61aed9665ba3227e8f47696afc15c1b3309f29d77166eb44a98d72f27a5b042c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous external URIs, many of which point to disposable hosting, suggesting a link farm used to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper or redirector to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 67 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://lnimeina.it/userfiles/files/kejox.pdf In PDF document text
    • http://suamayin.biz/userfiles/file/sawapezebiwugev.pdfIn PDF document text
    • http://kes.org/upload/editor/files/94495045389.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/44756592433.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133961ba8b87---rakulol.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/kelenoxavis.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/giduwotedu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/48157804034.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rolisitofimofutifi.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/vagefoxab.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/42006847161.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/92018032074.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/ranelarawa.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7ebaacd80d8585e1365893b221f4dff5/rovaxojivi.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/34332299771.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/6445369338.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///29217071398.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/3762255863.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rokukomufukilak.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/25331232896.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/botufixeleneneniguro.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/gedavedoxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oet+reading+for+nurses+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_off0000ad27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD27 14228 bytes
SHA-256: 039a6de3a17bcad710bd171eb84ff7ad2e901beb7f857d65a71012419cb0e01d
font_01_sfnt_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 10752 bytes
SHA-256: cfcf2d8b4343cdca97268ef57f8b1001a4162e6a27927ee13aef9ff3bd59e93c
font_02_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1