Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e574032591b0f1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 23:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa480d24c62e7eea9a9a0a9eb6ddce03 SHA-1: ebb57e8165fdbc40ec9f32253375bd1a97557afb SHA-256: 49e574032591b0f1079f8907f50a20db7a78fdc4dc9eae50b0593b47e6440f31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, while heavily obfuscated, are consistent with attempts to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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://www.evisiontiendaonline.com/ckfinder/userfiles/files/80615672654.pdf In PDF document text
    • http://pileshoppen.dk/userfiles/file/4642731445.pdfIn PDF document text
    • https://panama4d.com/contents/files/tefuji.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/81995165589.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/3864453936.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/lefefebubaxubigifep.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/10773418476.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/50830791834.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/54654666825.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zaxabukirexaduwamubi.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/jelelixiwone.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/fukogu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/mapinuloxunovenerixa.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/13440166716.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33592800448.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wedajemowoloxozaka.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/tofovuwijafemefuwanuvada.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/fonetofejanoridinipoxi.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/76886980985.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904225445692153.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/21778962236.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1720c1920---12001088485.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mologetevidusumebaduzaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=virtual+cdu+737+apkPDF 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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 19252 bytes
SHA-256: 9e16daf0e679d07d52097004a2c73b421d1bf74869b1b81cf7b5d2719f3849be
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10364 bytes
SHA-256: 879e6cf77ae37dbd60376587e3bec7b78671944341c6f301bdac7e9e5a4da524
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1