Malicious PDF — malware analysis report

Static analysis result for SHA-256 562c32a920ef2a4e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d345d9e0fe88b29b6e3684a9cd91617b SHA-1: 1eca37b1b103800d001b57104ea4cae5b1d7a430 SHA-256: 562c32a920ef2a4eec83d25dc66ec686fd7fb183c6b1e5ec6d565531b77da43f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism likely intended to lead users to phishing sites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ap116.ru/userfiles/file/xitatovifojunit.pdf In PDF document text
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/31970895899.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/jowufotexobuguwunuxugomep.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/70791638324.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/53261719476.pdfIn PDF document text
    • http://czyxchem.com/upload/files/ruditagexi.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/gurun.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/gudaxubituxosusiga.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/87557984384.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/gagumajotunalure.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be24b5060e---tiwagisobabodilut.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/voxarowipudalaruxi.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/23886034210.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16144a948ca35a---73698151816.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/lowojakibudajusasugiwexa.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/3859865829.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613e4600c762f.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/42596594152.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613538867d537---gogelaguzidopopufa.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/83550130569.pdfIn PDF document text
    • http://seamacros.com/upload/file/rijodomesetezepem.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/39384036080.pdfIn PDF document text
    • http://qwerty.pl/_data/file/durok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+unlock+your+phone+if+you+forget+your+passwordPDF 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_off0000b10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 15896 bytes
SHA-256: 8f20fe7f6c85cf03071b6476ad00c4e5f89969f771b2a9202adaee048a5bdff8
font_01_sfnt_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 11284 bytes
SHA-256: fdd0ba24b81a0eabfbd90bf73d3ece9fdbb6000e2908d6e34d213827d5cb305d