Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a4f597517d8aaa…

MALICIOUS

PDF

76.1 KB Created: 2021-09-27 23:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82cd163108449da0c8fa84100b3178b5 SHA-1: 28e669041c4c1e4965b3be71fa5333acc8e1a9b6 SHA-256: 49a4f597517d8aaa1b7157d7e3d46534e3458b37193ff2c00e082e6deb1356a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to PDF files on distinct hosts, suggesting a link farm or SEO poisoning tactic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, indicating a likely intent to drive traffic to a network of potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://japanbizkorea.com/userData/ebizro_board/file/45754731334.pdf
    • http://synphabase.ch/upload/file/boketoxesixijojumunafifo.pdf
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/foxexubitopepukumijon.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/93399657462.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/965224610.pdf
    • https://ntc-container.com/upload/files/40873280587.pdf
    • http://sasnowosielski.com/ckfinder/userfiles/files/ginerelomewusawotigozeseg.pdf
    • https://hinaweb.com/upload/file/lekepel.pdf
    • http://kargo-box.com/uploads/files/81055329938.pdf
    • https://kiptep.ru/file/vanamajizujorowotozesov.pdf
    • http://japanbizkorea.com/userData/ebizro_board/file/53653949750.pdf
    • http://sysquare.com/UserFiles/files/xibafapidaforikigovukul.pdf
    • http://cuspsurgeons.com/userfiles/file/bazoxesutokabaxidi.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109080125239820.pdf
    • http://amongelite.com/ci/userfiles/files/ruforatakovi.pdf
    • https://vinniescustoms.com/userfiles/files/35863036998.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/dexer.pdf
    • http://revucue.com/ckfinder/userfiles/files/nevawojoluniguj.pdf
    • http://jan-fotografie.nl/upload/files/46163030532.pdf
    • https://kompaspt2.com/contents/files/47044246831.pdf
    • http://kag.fr/userfiles/file/loxosuzezifo.pdf
    • http://thaiboxes.com/piceditor/file/39180863457.pdf
    • http://sportsgarten.com/editorData/file/37800764081.pdf
    • http://kommunikator.nu/demo/userfiles/file///sakofazikomomib.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161345be67d407---pujeduk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wifi+display+download
    • 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_off0000c1bd.bin
653594182bc0f20a175b62d70a2d205df1ce34b9f6c61b5a1002fdca0d44de75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BD 18936 bytes
font_01_sfnt_off0000f2fc.bin
553450a49da3293dbd271388fa5f6501f5391f20386ab9edf259d694b0b09210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10356 bytes
font_02_sfnt_off00010a80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes

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