Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6e2630e76d698b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-09 14:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b71ea1ef10e2344b52e4d9e8b2290c59 SHA-1: b49fd0b5743f087a06577af86faac3a28a3db8cb SHA-256: db6e2630e76d698b0ba72e2a713af4b84a1d9c9732c3eb96b27cc532e86fc7b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on disposable or unknown domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zaxidumexiva.pdf
    • http://proreferee.ru/uploads/ckfinder/files/kuben.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/juwidenadowuzowesu.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/63180129390.pdf
    • http://billsky.ee/files/file/kejurugefa.pdf
    • https://hoakhanh.vn/uploads/image/files/26599016076.pdf
    • http://vititanon.com/user_img/files/48791203351.pdf
    • http://gamax-moto.cz/data/dokumenty/xabetagesuron.pdf
    • https://aurorabersinar2.com/contents/files/66008620311.pdf
    • https://pernambucoimortal.com/imagens/files/16202701564.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/gifoduforogizapakevo.pdf
    • http://scpt.it/userfiles/files/kefuwaxenujak.pdf
    • http://dyglas.com/userData/board/file/duzapubadu.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/velawewikoxof.pdf
    • http://ip-malkov.ru/uploads/files/nanoxeros.pdf
    • http://xahuaheng.cn/userfiles/file/wojebimuf.pdf
    • http://nationalherbo.com/userfiles/file/kilebabewolora.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/jilabuwamaripudeteritujip.pdf
    • http://csc0512.com/userfiles/file/20210903223027_v4nbut.pdf
    • http://birdwatching.sk/media/file/gabevejokunenevijowakudir.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/61295048032.pdf
    • http://letdentalab.com/img/files/maboxiwas.pdf
    • http://timnhanhonline.vn/upload/files/63110346467.pdf
    • http://hyosangjo.com/userfiles/file/20210903095730.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vanavil+avvaiyar+tamil+font+for+android
    • 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_off0000b6fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 16792 bytes
font_01_sfnt_off0000cf15.bin
0eb359083f67d51ee49ec99cefa0d23c36b572a09747208185d9fe7ff555d364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 10364 bytes
font_02_sfnt_off0000e679.bin
b1cc7e0c42efea707c35f40f0a5839068b469fedf9c43792cd91a0970d2b3670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 16704 bytes

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