Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fcae55c2235283…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 13:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91c5c85ffecbb390ff9220ac5dfe0314 SHA-1: a51c1a548c253ffb3b51cee58755c756857ee7db SHA-256: 92fcae55c223528322b831370ca69549603c2b942f3e4ad662e27481512fe3db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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=unlimited+money+dls+2019
    • http://marchmont.ru/imgs/file/vaxowuvo.pdf
    • http://hulstcustoms.ru/uploads/files/wowuxebidepazo.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7038576b---wenifowawunetoliza.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/55054751874.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b9tjrdssu3fn39sd0q95rgeg8i/kupaxitikofelovi.pdf
    • http://simp-q.ru/userfiles/file/77447371964.pdf
    • https://lompatjauh.com/contents/files/44966349378.pdf
    • http://kkagro.com/media/images/upload/file/70139938412.pdf
    • http://hai-bi.com/uploads/files/202109010526107251.pdf
    • http://ecolservizinettuno.com/userfiles/files/98592294544.pdf
    • http://theloanwala.com/userfiles/file/84415974740.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/21851494085.pdf
    • https://ncvpte.in/userfiles/file/wituvokupusozuzedop.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/88301465645.pdf
    • https://value.ae/userfiles/file/pobafijulibebiromukubu.pdf
    • http://espaciocultivarte.com/ckfinder/userfiles/files/zotokoxokojatevenugi.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tatunewibusaxaloje.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/29618919425.pdf
    • http://eotp.info/sites/default/files/fck/file/74072187141.pdf
    • http://terrietanaka.com/library/files/lukexijebor.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/51094575470.pdf
    • http://avatars.ru/userfiles/file/feluguxawufawazajum.pdf
    • https://ezastupitelstvo.sk/editor_uploads/system/files/35693130400.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_off0000d392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 16792 bytes
font_01_sfnt_off0000eba4.bin
bc9c51976874689a0e4886ef9fc8cf6001ef5eeffce1a47644cb0a782a4495b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 17656 bytes
font_02_sfnt_off00011934.bin
8b855a0d17e90210e10bb3a81c1732b6105b63f26d4183f4c34322b45e0171e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 10728 bytes

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