Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6f450db1477d5d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 07:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06f5771ef25eb962c441fc95b9e5ae05 SHA-1: 4d8b4e8b7491599d9c57088a9d70d96f48f36ea9 SHA-256: db6f450db1477d5d61bc1fcbca0cb83c0ec610d7e2c3c8723fc6a67239aa2b44
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://wastran.ru/uplcv?utm_term=why+are+rainforests+important+for+medicine
    • https://freebcard.com/ckfinder/userfiles/files/funuxuwiveligotonurukev.pdf
    • http://carscaso.com/js/upload/files/zubusoperade.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/xanavojudibakawezipima.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/jesepubedafetobenifulozef.pdf
    • http://renknh.com/ckupload/files/xudesupewilavomokonawozud.pdf
    • https://shen-su.eu/gfx/userfiles/files/fexupisezirekevajasibapap.pdf
    • https://delcinfo.ru/img/files/files/18608680425.pdf
    • http://balie.overeembv-profielen.nl/upload/files/retojememumujugazelemaxa.pdf
    • http://houstontca.org/Content/uploads/files/32575415294.pdf
    • https://highlander-inn.com/assets/userfiles/files/789815213.pdf
    • http://agriturismolionsfarm.it/userfiles/files/64045434947.pdf
    • https://hanedantoptan.com/upload/files/zibanosanuduv.pdf
    • http://belovosushi.ru/files/bemumesaf.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d91c483089---tovijikigokaxeb.pdf
    • http://warmistore.com/userfiles/file/xukesamulotimu.pdf
    • http://www.awakohchang.com/image/upload/File/ifulanunavukuriwobanak.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/fenifasemeso.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/40522828478.pdf
    • https://ud-hobby.com/images/Upload/file/jemisufijesuruvep.pdf
    • https://seger.cz/userfiles/file/76541971166.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/58109992157.pdf
    • http://ambulatorioveterinariocigliano.com/userfiles/files/dokovuzudavadi.pdf
    • http://amoy-art.com/Upload/file/bazapulekire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
font_01_sfnt_off0000f156.bin
69eb17318b91fc2b17b3f68dc7bb3e3be97887a2d06e0d63749b6a7d5b710bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10948 bytes
font_02_sfnt_off00010a93.bin
dabf0d407c4b58604fc811fdd48b29fe1bd24de43bb58a6dcf49e8c577db6b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 16840 bytes

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