Malicious PDF — malware analysis report

Static analysis result for SHA-256 264eee6b9ce52cd2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 13:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6251c0632da71f7bd96a46d6e03b217 SHA-1: 8bddbaa8404e194f905cb3342f0e516b7876676a SHA-256: 264eee6b9ce52cd2e2bfaea81f0600cd2249c043572278ea48a8ef9b040d2004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=my+android+tools+apk
    • http://kaus21.com/userData/board/file/nilewitipodutinomesixo.pdf
    • http://lulanjina.net/upload/files/1163405936.pdf
    • https://cardion.dk/gfx/fckimages/file/52345145178.pdf
    • http://takramaipai.com/mypicture/file/xidixibuzelol.pdf
    • https://siangyun.com/upfiles/editor/files/fesuwi.pdf
    • https://gsm.company/ckfinder/userfiles/files/fanadakeka.pdf
    • https://mmgrowersg.com/ckfinder/userfiles/files/20423710913.pdf
    • http://otpetye.com/images/shared/file/kewakipejes.pdf
    • http://goldenmallbiotech.com/upload/files/javapodate.pdf
    • http://opsir.eu/files/file/mavesudemomojedanibadi.pdf
    • http://hoangnamjsc.com/upload/files/togomopofapopizixitanuwi.pdf
    • http://www.offshoreyachts.net/web_upload/editor/files/16942290753.pdf
    • http://bronia.org/userfiles/file/47700075758.pdf
    • http://decorstore.eu/upload/file/viwukefez.pdf
    • http://kawana.tech/userfiles/file/69888117418.pdf
    • https://markapin.com/calisma2/files/uploads/69210229601.pdf
    • http://www.jobibon.com/admin/userfiles/file/55677153104.pdf
    • http://kadh.kr/bobod/upload/file/92277091513.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143599bc11fc---bupufo.pdf
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/lofilifagurajis.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/morimododatuben.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901072845.pdf
    • http://tamker.hu/userfiles/file/60912973616.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_off0000d935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 16792 bytes
font_01_sfnt_off0000f14c.bin
c8fd098ffa89183bc5d073e2286c9c106ba5f2733cb3f84570e909d0950da4bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 10452 bytes
font_02_sfnt_off00010914.bin
3f82785060567ebfa769793da16354d8aed3549def3cb76fcecb8ddba3e62510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 17888 bytes

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