Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4495393ad194ce2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 03:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5312f27256c93bf7d13685ddab94789 SHA-1: 7ca0cfc2c0d8054488b9f04bb73de566afc86901 SHA-256: c4495393ad194ce2a9fad721c0de8b4c21981a680f3820b703c2fb8b6126833a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to various domains, indicating a link farm designed to obscure the ultimate destination. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0cc3259ce30506fc83bd2e2e1f89a8ce/firunulugar.pdf In PDF document text
    • http://hainfelderteich.at/busomukidojunaji.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/30035460348.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/64242962062.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/30470516498.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/47636236233.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/wakezavebodinutolab.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169a87a339---88413982910.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/jugazetasigenajofexezab.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/58221771174.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/23011810910.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/43948032242.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/33010198529.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/furabalatufamezawakaxevav.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/12651288833.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/91924690560.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/44766848122.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/62321357438.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/fikivirilusoguwagaguvo.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/devafifajarozofij.pdfIn PDF document text
    • http://pi-consulting.ch/download/fesitawupinep.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/figomoluni.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dulogeroxuminubonetefo.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jemaduxex.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210903_D9D765228E06E35A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+save+apps+to+sd+cardPDF 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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10408 bytes
SHA-256: c8b1b59ae52741f75817fbe0e96b14a615c45fe4697ae0a33f75d9dca730933f
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 17696 bytes
SHA-256: a96f6fefedb6a9f0f23fdb0a9a539dcae5922c6a8b6ec96aecaa264b2f71982e
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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