Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76d5bfdb0671ba2…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 09:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 520352e3bc619ed4d99863a21eabef26 SHA-1: df2079bd8f2c23191aabb3069b8894f6f49bf646 SHA-256: c76d5bfdb0671ba2267f8a7941ef6aa11f5026448a0d0d3e38f8e6f3ea1c98b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=extreme+football+3on3+multiplayer+soccer+mod+apk PDF link annotation
    • http://flairpens.ru/uploads/files/40157881433.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/diserefegabefalotavog.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/50729512097.pdfIn PDF document text
    • http://goldmustang.com/files/files/pikedakubeto.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/74956263772.pdfIn PDF document text
    • https://kermanrooz.com/img/files/lugetokili.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/68113806547.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/20113255696.pdfIn PDF document text
    • https://attack.lt/images/files/16412009458.pdfIn PDF document text
    • https://negaratoto.com/contents/files/werizoriwotawazajasita.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997c120f41---mavibako.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/dawobarirev.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/71704039609.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/68247083390.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/33610482537.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109031605188637.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/gemiviwekip.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jepasub.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/95441238034.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/63876272823.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/bodenoxoli.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/32826010619.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_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 11484 bytes
SHA-256: bac0e8abbdda125dec86383068e668aef36ec1e1f17f8accb607f0ff64e2f448
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 19480 bytes
SHA-256: 13d0ae752057efa631fe5ebc53d7c062e725ec9dd46aea525c723892a774e495
font_02_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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