Malicious PDF — malware analysis report

Static analysis result for SHA-256 42301bbd338c12f9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 03:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29ed493c25a7a51c4977bcb1ee45e2df SHA-1: 4d65eac5ae4ccb39c41375dcc5d2e7394141c7fc SHA-256: 42301bbd338c12f9f586d46bd15ea8f08b56877a64f47543641160472b44e957
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the listed external URLs for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=how+do+you+set+ringtone
    • http://gopherandsquirrelcontrol.com/admin/images/file/razawivanizudoli.pdf
    • http://balone.net/_upload/file///4795306591.pdf
    • http://rialta.ie/userfiles/files/xupaxata.pdf
    • http://mtkshop.com/images/uploads/file/bejumosotut.pdf
    • https://dolupin.com/calisma2/files/uploads/sitosa.pdf
    • http://yugang360.com/upload_fck/file/2021-9-21/20210921080031557242.pdf
    • https://businesslife.com/content/files/73414569291.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e68f3bf87---gamedefakifabevi.pdf
    • http://lysfyyy.com/upload/files/7099276810.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/soboziwosuso.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/parefotejuji.pdf
    • http://turatabor.hu/media/76344974347.pdf
    • http://maezawa-jidousha.com/js/upload/files/kumekugupeludaki.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/8845246458.pdf
    • http://boden.boj.se/uploads/userfiles/files/56480067127.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/wokarofetatimasemitosusuk.pdf
    • https://hzautomatisering.nl/userfiles/file/45369168169.pdf
    • http://bright-mineral.com/uploadfile/file/2021090304465786.pdf
    • http://samurairamenbar.com/uploads/files/55946451959.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/75827463313.pdf
    • http://tamker.hu/userfiles/file/67707851085.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85b97515b---fexazegamabapirig.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kikepivag.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_off0000b3eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 16792 bytes
font_01_sfnt_off0000cbfd.bin
4fcc1eb61ce8e170ce2624eb23787518d59938db1a3fac21711ae80158d7a1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 16584 bytes
font_02_sfnt_off0000f639.bin
ab5f1b5f3bf78a15bdcb4547a82b067714191747c8ad2892f7d6dcdab1175bd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 10504 bytes

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