Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3ddb677777e036…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 05:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 055ff97de601b419d7e72efb57d1a6ae SHA-1: 76f3256e0c192ebe04a47a7fb73f3e1fc8c1689c SHA-256: ec3ddb677777e036dfeeba2fac9f075177c151a4b11977cb56c86ffa32ad23d2
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 a large number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=cast+to+device+android PDF link annotation
    • https://micro-logic.ro/images/uploaded/file/84612088051.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/vovebejanupokomofe.pdfIn PDF document text
    • https://airxps.com/userfiles/files/30913718279.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/94826029228.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/kufefe.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/85911615883.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/71ce40ed2eccddba52f1f83fa53e9ece/fugonipanaxuxof.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/joruzorozavifubivupu.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/lamodanimovisokujejuna.pdfIn PDF document text
    • http://roocenter.ru/upload/file/34348665149.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/48940587055.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/mozogej.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/wewigabebujupovav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a449ab0302---15885779460.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/kifavudumekuferutofox.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/36100183335.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/puxopokisi.pdfIn PDF document text
    • http://full814.com/upload/files/xenesobixexek.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/sawuwepupewapim.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/18838817912.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/delifa.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nefepatovujo.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/68741643851.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kunevigotifigoxegejivi.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/tuxesobub.pdfIn PDF document text
    • 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 10416 bytes
SHA-256: d33b30f46d3d30fbcffa189990ba9b2291fa66feb1e057c16535706b71ee11c9
font_02_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16544 bytes
SHA-256: 55632d84ae06647ed56ca5b4d117fc6614432c7868a19299e724cf436a439eb4

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