Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2247e170f40d2b5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 11:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5847c575f9ddf9e056b1f87ce6edf5e0 SHA-1: 122a407f1ea7cef76954f348752689e0b6ec8370 SHA-256: c2247e170f40d2b5f3b12d13b470595aa8675b4ac960c74995b4319e8bd759ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts, suggesting a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript to facilitate malicious actions like redirecting users to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://polyalpan.hu/_user/file/14117573940.pdf In PDF document text
    • https://cuatudongnhatrang.com/uploads/files/menizikakiwomovezefozadi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/52835754928.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/72067642383.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/18025548690.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vesoko.pdfIn PDF document text
    • http://lean-ds.com/upload/editor/file/befesofivorumofuruna.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/6766074044.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vizirepa.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/xudotiwewa.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/79521626923.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/zosorezikaxebez.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/22812128788.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/divazalaziji.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/jisazuwilebigefamujix.pdfIn PDF document text
    • http://4bx.pl/public/file/82257266472.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/99023390515.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/65460614458.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/wukobosolobufonuju.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a300f5bc---2721023128.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/15459252387.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8398c1b9600c04c0f4eb37b78814f57/82604292229.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905135600.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/86651334579.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/vuvefaduloj.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/87797320332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fifty+shades+of+grey+streaming+vfPDF 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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 10912 bytes
SHA-256: 3a139d006a47e6f6beb0f530c1604bc17bdc10d4feb3838e67a6920efa23be5b
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 18812 bytes
SHA-256: 69719ccaf7a5c2a8165a953a53d86bcd9c00648e18adfd6fa8a4f0783c78ad2b