Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4b0bde78a247c3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 02:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c1693fd9d6f915dc4576612faa59dd0 SHA-1: 5a19476f07694c2b33681a23b2b271511c86cea4 SHA-256: 0f4b0bde78a247c37dfdf16acceddb4c074a4d483e40e6ba300163d9d0ebb89f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vutogawoniwonenitasajexen.pdf In PDF document text
    • http://tipsclubcr.com/campannas/file/duzewubozosirovu.pdfIn PDF document text
    • https://eternalbliss.net/file/42096594232.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/54229030702.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/49046781260.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/57015076319.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/53082466216.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/55870370292.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/94274196397.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/85997263478.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xemudanawad.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/61438503369.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8f574927---luzaga.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/88701324976.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/luwetudikobudaruzifil.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b5e1c28ff404750158dd22bd0cc78982/1393116649.pdfIn PDF document text
    • http://rapet.hu/files/jufomis.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61938374621.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109030844406591.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/gurinavopifej.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/96787094388.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/betikurewokurikodepejut.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/zekovunaposo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=app+lock+download+2018PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 17980 bytes
SHA-256: e23447fbc568f1a5a5bd067d1a05d7f05e2801fbafee37bae6aabe4c06654e0c
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 10580 bytes
SHA-256: 5d9e0636205a0573e57059a352263ee95923210c4beb211aa52698f107a22883

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