Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f990c0c9103df7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 22:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f519fddb9f24df987a77cefda5c5a285 SHA-1: b0ae71bcd2b94168bea4137aa15df4261c62c595 SHA-256: d3f990c0c9103df734fa284966c720351bb57e4c48712e713fb0993e1883a7ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=how+to+change+wifi+icon+on+android
    • http://bumsnab.ru/uploads/files/99759010628.pdf
    • http://kirche-treuen.de/UserFiles/File/73597141501.pdf
    • http://shijijiaming.net/filespath/files/20210901111928.pdf
    • http://fujiya-burbank.com/uploads/files/jexukafoburube.pdf
    • http://clarksville.net/wysiwygfiles/file/niralunederodagisiwivoveb.pdf
    • https://interstudy.net/userfiles/file/64304536563.pdf
    • https://ppntassone.it/dati/upload/file/98932803307.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/99878552732.pdf
    • https://qatarsecurityservices.com/public_html/userfiles/file/nisasiriwakejavamu.pdf
    • https://viettincapital.vn/upload/files/milasiziwudaral.pdf
    • http://berbun.com/user_img/file/24226428766.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115062add2---kosavimubufidisi.pdf
    • http://cpils.com/userfiles/file/wiponuzidevuwotusiwob.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/55525800015.pdf
    • http://chip-chup.hu/upload/file/fabubadaranepewewukejana.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dajojanu.pdf
    • http://travelport.pl/userfiles/file/67750087302.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/98632206043.pdf
    • http://goodtraefarm.com/ckupload/files/77122736237.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/balunilerufarexatutolo.pdf
    • https://kuzeyilac.com/resimler/files/xoxomixus.pdf
    • http://aftckwt.com/uploads/file/movuzaponepiw.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae0e0c6d1---83164770349.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/30845153265.pdf
    • http://wwm-quanta.com/upload/files/91095349167.pdf
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/fisupizerajudojijuvolegew.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_off0000defe.bin
cd3a1b3e26b515f222cea05b1e569bdf20b9407b8111fd71c3674ef8e0db4267		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 18876 bytes
font_01_sfnt_off00011069.bin
9addebaf455e655119cbd8448921d18f7b6f60a99c457209d97ed441d28ad24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 10620 bytes
font_02_sfnt_off00012874.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16792 bytes

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