Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa487c5dcfd66c71…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 12:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01a0f47f568abfb17ac9aa9acd9d36f9 SHA-1: ad34642aafba9a8847e413aefeed1bfbda218bcf SHA-256: fa487c5dcfd66c71137454131b190eb0f36934be301f05a220f469452f3d9919
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bighost.vn/uploads/userfiles/file/joniwet.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/44089820826.pdf
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109080112311965.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/841550289.pdf
    • http://chochosanencino.com/uploads/files/9638432570.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/malodujoduzazabamepenej.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-03-19-26-91.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/51483646657.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/jogimimodetu.pdf
    • http://watchimport.eu/userfiles/file/fefumotevam.pdf
    • http://solo-reisen.com/media/images/file/90763858261.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nin818u088v7ooj2lv1vgr4u97/50135160282.pdf
    • https://kaptenhoki.info/contents/files/43007645640.pdf
    • http://sotel-perm.ru/site/file/vimoxekiwarubitupage.pdf
    • https://hiperaktivite.info/userfiles/files/38450281367.pdf
    • http://veitali.com/upload/files/judalobatiwaru.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/pevegufajenotiruxez.pdf
    • http://daiichigroup.net/uploads/news_file/mijavowirep.pdf
    • http://mt-filtration.com/uploaded/file/85650824861311d9dce149.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/70155196682.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/rilimovodaxobeduvamanax.pdf
    • https://powermailer.in/userfiles/file/komiresosa.pdf
    • https://ayurmitra.com/files/file/rosebu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=neoprene+rubber+material+properties
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/27948247507.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_off0000e388.bin
92c8d4508f52b7499e187c7dd58b56e7179267d5ff3fa991e40c53043c24872f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 18752 bytes
font_01_sfnt_off00011480.bin
6259b74251e200a0632e1eb574bffd7012d7e2fd87c25609ece41170eab0dabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10632 bytes
font_02_sfnt_off00012c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C94 16792 bytes

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