Malicious PDF — malware analysis report

Static analysis result for SHA-256 6694e3c6ae173a51…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 02:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb5e8f2c73a55fd7e43f147d79fd29da SHA-1: 2babf7aabe81244253e599868bcb554e3624a95d SHA-256: 6694e3c6ae173a518e3980a8e240dfcb49a11bf2a465e49e8a6dd022d686ae3f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=where+is+the+mms+on+my+android+phone PDF link annotation
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/9969839827.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210913174917.pdfIn PDF document text
    • http://unsersohn.com/images/file/92555254706.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/15623007128.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311472ceb85---48698917692.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/wowejejumijugijafuvupu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/fusavowuvolafuxezewirag.pdfIn PDF document text
    • http://gestioniarmatoriali.it/1843378733.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/sepuna.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/dodivok.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/gegerozanilusowal.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913082315.pdfIn PDF document text
    • http://guitarenko.fr/img/files/runedadozojijonunovi.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/97671962041.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/70026791191.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/fiwirexibulivofajodum.pdfIn PDF document text
    • http://workontext.ru/media/file/gesibo.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/73347214754.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/guwotujokikasopodope.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/laxubiduvoxofizemidasoxa.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gavularinuxava.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78152060739.pdfIn PDF document text
    • 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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 17620 bytes
SHA-256: 1571ff8935549a9cde9c73e105c5ba63a3783a6377ab46c5e82ffab955e9b899
font_01_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 10720 bytes
SHA-256: d3db67224f29ca36d06fa6bbd94c2bc1ecf9cf26d4db557fb0a7df787c1b2414

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