Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18762abef4b9d53…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 08:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce2f5b9e6672595822527c4b60fe55fc SHA-1: 06baeb04daae4cc221d91db7ac3b6a32c539d07c SHA-256: e18762abef4b9d53a9d1ad89da0b72eba6a5b3679e9a155a952e87fa0cbfcc4f
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

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://allytemp.ru/uplcv?utm_term=smart+connect+apk
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sirisuvonedafuw.pdf
    • http://sunway.me/ROOT_PATHuploads/file/07051909470.pdf
    • http://studiodugnani.it/userfiles/files/xudugeduvamomabat.pdf
    • http://vititanon.com/user_img/files/27893733066.pdf
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/pumizotigagomi.pdf
    • http://v-lukomorie.com/uploader/files/xuberoretatenewemovefa.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/xupotajubalubugajabita.pdf
    • http://maynenkhiinverter.com/media/ftp/file/65030804901.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/fajolugelu.pdf
    • http://matrixpaint.com/ckfinder/userfiles/files/87485573963.pdf
    • https://aczv.fr/userfiles/file/fajepapozerisu.pdf
    • http://portaldo.eu/contenuti/upload/file/24302180579.pdf
    • https://suadienlanhhanoi.net/upload/files/73164744181.pdf
    • https://samngaimarble.com/html_upload/file/nojigobidezetezoni.pdf
    • https://nepalihemp.com/ckfinder/userfiles/files/95690487130.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2250a1bef---vixezalam.pdf
    • https://stradatextiles.com/upload/ckfinder/files/80678308108.pdf
    • http://artpolinakuzina.ru/pict/file/5767641012.pdf
    • https://cengilli.com/icerik_images/file/lakoxazanutegivotisukuziv.pdf
    • http://saluteebenesseresas.it/userfiles/files/39653771402.pdf
    • http://nedirajtebosnu.net/userfiles/file/lujuwojonirusajogegewor.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/15423235550.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/6792579334.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07b2c49ed---gegigixalabifunekos.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_off0000c5ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 16792 bytes
font_01_sfnt_off0000ddbd.bin
8ad55807c6b7ea1ca6c62a22ce108bfde34c9035add984f26607b1f0f677b513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 19608 bytes
font_02_sfnt_off000111df.bin
45a2067c00053d40e30e230b5ea68786687b09d70b2f9bb02523498982cd78a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10396 bytes

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