Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ac5fb36349d7c4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 01:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a55b28f5647ddf34670266e66190ec6e SHA-1: 20b0b44d227af91a37f5290bcb6326f45abbc37f SHA-256: 19ac5fb36349d7c4d2071b78406f9d366d42b76906cc86e8e655d6219ab2f78a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://svb-volleyball.de/userfiles/file/67450834815.pdf In PDF document text
    • https://sluganarodu.org/userfiles/files/49840828250.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/bibilosinasuga.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/varaxav.pdfIn PDF document text
    • https://ratosatu.com/contents/files/sonejoruwekotidu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/52334422265.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/29920350536.pdfIn PDF document text
    • https://maria-galland.ru/files/file/regomovel.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/gazimigikobuduv.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/66080650054.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/tupubesaxukolukoxo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161402e299ece1---97863244912.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/71567692471.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/63964542627.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/5006666530.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136203958bd7---wigimilalavaxeke.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/19922892301.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/54807386788.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/xegezafis.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109081613561017.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nazifolotalit.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/15489603094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mp3+tag+editor+apk+downloadPDF 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_off0000bf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7D 10740 bytes
SHA-256: e8bb09e61069326b031f6783cdf21ed8c704814b3a62828af8079555c7eff46c
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 16760 bytes
SHA-256: e5a04f4b50887bb6815a5a47c992e286f6c1424ea230b549d975f49a784254fc
font_02_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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