Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7258fe949cd2219…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 06:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f1e2af03fca0ff9d016b2b71e2fff8e SHA-1: 4add83c45a559cbc61e8451de108603b6df43e15 SHA-256: f7258fe949cd2219cc82c651c3cba0eb384bb0ddacc267b706855469fff0223e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. 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 URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=instagram+followers+check+app PDF link annotation
    • http://terezmisszio.eu/files/file/84493019028.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/92821440382.pdfIn PDF document text
    • http://dominant.name/userfiles/file/dawajatuminudu.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/dojavenalarasinojofo.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/xamiweluvijopiseva.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134b10c2838d---58991097799.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kihnbhgtjraankfd2a1hficgrk/lekopudu.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/85203364606.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53645947493.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/sivegodamogifikopubasu.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109030959308580.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/vuxomenixaxagite.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/62172121931.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zubizufepatajoli.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/3406849821.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/10959647563.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/bobozurosowotuboxuzojixu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/nexotoboxevisa.pdfIn PDF document text
    • http://tyextractor.com/d/files/3515401128.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/xizogezokirevetagomitumad.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/19852052918.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/60728346189.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_off0000ac32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC32 14408 bytes
SHA-256: 8e4948eff498662d988e6a59bcbccd34563554a7097d7ca7980948861e8d2105
font_01_sfnt_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 10964 bytes
SHA-256: e6dbbb80c99a1090c3f659804726a8aea0c08589b6ab15bff8832437b57f76e8

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