Malicious PDF — malware analysis report

Static analysis result for SHA-256 a562fbd6c9b116f7…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 01:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86c7e08fd6fb652d8e61fac1edc9842f SHA-1: 8e6592b8b9da6c7d0f54c66a2dcbe6e984d882db SHA-256: a562fbd6c9b116f7e68524fde30373a16b0a3f478af0c9b3fa44d2dce28eb773
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a malicious site or download a secondary payload. The PDF's structure and the high number of external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://luluscafeonline.com/uploads/files/13792398095.pdf In PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/maxejarixasijiwibavagibi.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210901232526.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/duzikiz.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/wiverutanizino.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de399d0dd---rokasixezapalukogopusen.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/zegufewir.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/wusisupotugulokexolomof.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/34681158487.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/36911374426.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/wulubomakuporala.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/wivuxozilirabuweta.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/35687548730.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/18305696925.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/18881473155.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/53741226120.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/zonulosekixeluxex.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/33280382726.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/78596336085.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/reroxetararo.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210903093316.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/22327409611.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/88546850502.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/76387880983.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/49580273957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+install+google+playstore+in+android+phonesPDF 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_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16776 bytes
SHA-256: 09940290116068ffd267f33cddb55b064c4520bbe8faa14f559da861cfb4eb0f
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10864 bytes
SHA-256: 00500da7cb2c7478ed7ea7c753007e824b1fce4b336f7579c209d6e3b27a022a