Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e283b01d5d65b6…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 00:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e78e8ebd4840499997ee2531a295196d SHA-1: 28f268531da4ed2ad8c73f5573f864c2e50ac8a1 SHA-256: 73e283b01d5d65b62aa699c1731ba62786064dacf1311ce4181d4ce73ec993c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is identified as a link farm designed to redirect users. The presence of external URIs and the overall structure suggest an attempt to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://trunglamdecor.com/uploads/userfiles/file/24819081564.pdf In PDF document text
    • http://materialdeestudo.top/userfiles/files/24041828917.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/lupefidunakisakerawatig.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/tixagavotulawilagusodu.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zimuwelape.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kavasovenatabivafi.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/97223664755.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/zewawobalew.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/4220883816.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/82568449816.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109021833039738.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/nawetokome.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/40348159830.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/27248181882.pdfIn PDF document text
    • http://creationart.hu/files/file/fofopuluzivi.pdfIn PDF document text
    • https://ms01bet.net/contents/files/63273280622.pdfIn PDF document text
    • http://tzsunup.com/upload/ruwox.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/lemazirudopowusomidejaka.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/mufuwoxurewod.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/17444436601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=candy+crush+saga+king+online+playPDF 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_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 17768 bytes
SHA-256: 52a4c91874d152a70254067f16231ded251bb68c12f280f1c99025237168bb42
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 11032 bytes
SHA-256: 70480757e07036741849839f03991201c79ced40e8b3a0416b363c7c7aa96e84
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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