Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe71fb2f543483d9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 11:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53dff36c779c2a896a397c392237a8d1 SHA-1: 9da9c52d6dde3f84ac96cc772264905aab3a681e SHA-256: fe71fb2f543483d98c66e66ebaaa42518afb64a554b608b8150d7bb83f473e74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body is heavily obfuscated, but the presence of multiple URLs suggests a link farm or redirection mechanism to potentially malicious sites, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+copy+from+one+android+to+another
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/23173984988.pdf
    • https://workinhotel.com/upload/fckfile/27541325056.pdf
    • https://patoman.ro/ckfinder/userfiles/files/danaweruvojazuzep.pdf
    • http://1night2daytour.com/ckupload/files/mebizujowafuvenevu.pdf
    • http://athaj2.specialty-match.com/upload/files/16151728039.pdf
    • https://coolinterier.sk/upload/files/81245525287.pdf
    • https://alkathirilaw.com/userfiles/files/83956612141.pdf
    • http://banghetretruc.com/media/ftp/file/96520203042.pdf
    • http://ykzn8.com/upfiles/editor/files/tibudemisomasisu.pdf
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/96468676112.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62892591639.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/310292491.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a4300f28cda6ebb642f513dc0d604e56/63828491274.pdf
    • https://pastravariaizvoarelebratiei.ro/images/file/fazeboxolewiw.pdf
    • http://ydyb.com/filespath/files/20210910005751.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/xejolipepijivomafidokese.pdf
    • http://blackivy.pl/userfiles/file/luweduxekerudifaduba.pdf
    • http://autosklo.sk/pictures/file/35849226220.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/4944180590.pdf
    • https://tskrea.com/userfiles/file/wusimiduxufulijezu.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/70544316070.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/25254849889.pdf
    • http://boardmark.com/files/file/3294236816.pdf
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210918160827.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_off0000b116.bin
4f3ed68f74059e8314f5b7be71f4aa6193c2cff26566e270c2c0b2c4e44230dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 15588 bytes
font_01_sfnt_off0000d86f.bin
33569241b7ebeb8fe4239fc568dbc84bd127637dbda0758cf5e22994b61a4fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10864 bytes
font_02_sfnt_off0000f155.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 16792 bytes

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