Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8d4a218e30b0c2…

MALICIOUS

PDF

68.1 KB Created: 2021-09-11 00:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f32234fa38b06c8db2b5767cd571e7f3 SHA-1: db17d21fa561832cb429ec6ebf2f551ba95e2070 SHA-256: 8f8d4a218e30b0c26f84ea0f860e2e4df1dbfef071e1c470ce7ec533bb3b5b81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URLs, many of which appear to be part of a link farm, suggesting an attempt to redirect the user to malicious content or phishing pages. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

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 https://wastran.ru/uplcv?utm_term=watch+king+cobra+online+megavideo PDF link annotation
    • http://ecole.ru/text/images/file/vasapumiromajititubodobu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/34717556642.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/63696169947.pdfIn PDF document text
    • http://unseretochter.com/images/file/lutaxenafetil.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/kobix.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/64157194258.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/99768185144.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b23ced9e24---62542968476.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/jamolotopo.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/gatixezitijut.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/kusalovozejusizomijor.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/38445054852.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nijegukefew.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/fogopigafupi.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/430489858.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/lupatewufedukoxod.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/51335257356.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/82239028130.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/82848819626.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/50982016026.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/tikuvo.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_off0000ac49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC49 10940 bytes
SHA-256: bd060ae0b75a310dddc5080d56dd04ddb675a792f0b59e47b64f922adc2ac0ff
font_01_sfnt_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 15240 bytes
SHA-256: bdf28edb11d3615534e1719243284de2c6e9cb20b9e9dfcc52ce644b76711da1
font_02_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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