Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6df37fa58a0199f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdf218d22608df03e254b448b5e846ec SHA-1: 137a5e46dc62681d8e795d212bd2b4990cd68497 SHA-256: a6df37fa58a0199fd63148c7773595bc63f88937a59079f0d35a8175ee6e97cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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://nifaelectronics.com/userfiles/file/25076669579.pdf In PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/fisusaxila.pdfIn PDF document text
    • https://endobible.com/userfiles/file/55679878542.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/jakegitarepeneg.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/32095922750.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631303975.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/26301631049.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/karoguju.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/8271073824.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/nigidisenexobofa.pdfIn PDF document text
    • http://progetec.org/userfiles/files/tojusuj.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///purazolanejeme.pdfIn PDF document text
    • http://alltechsro.cz/files/23506485080.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/27706452643.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/nupaduxu.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/34384548750.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371dffc797f---musizuranipipigevudur.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/92465578028.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bojojivekinitimol.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/9129606462.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/winugodewi.pdfIn PDF document text
    • http://xsteelstock.com/d/files/buduno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=4k+note+20+ultra+wallpaperPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10488 bytes
SHA-256: f65200335bb00cf34a0fedb114e8ff2f8e4cacb8eb0b1420dc2337130a44cf6a
font_02_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 17824 bytes
SHA-256: 449618c6446f017ec6c814407dd111214cd90b6affd0199f4d47f2c1e42c2355

Open this report in the interactive analyzer, or submit your own file for analysis.