Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c6ddb414c237e6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 00:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62a03bb69238c287553f909ad172a6e6 SHA-1: 75dac8d2ceb7fc442742c21e634a9b7b5cef985c SHA-256: 09c6ddb414c237e682b11a690484003aeca486ed13f01764ebd15f1ade0f12e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing and malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cmflower-kkc.com/ckfinder/userfiles/files/96446578829.pdf In PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_140337.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/36784121694.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58933835215.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/84586908609.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/xulepopavuto.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/69963873916.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fuwifiderutebevuku.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tewigevijeke.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/80899056505.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136628ac1c5d---libupuwixuvoxubokutiz.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/32390726923.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/popanolexupodotu.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/tidukedazunaw.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/69095039966.pdfIn PDF document text
    • https://europartner2.pl/uploads/nalajaputuze.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/69650027654.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kesipe.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gekesoxavubaniwezuxuxama.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec886dbc36---berag.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/nifukewulovad.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zamogiwoduzoxoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ullu+all+web+seriesPDF 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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 10112 bytes
SHA-256: 7edaa6208804689358a3aabd4a68534efdcf2315765d2384d782cea02d98b4f9
font_02_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 17144 bytes
SHA-256: f61a92cd464dcfd6c02896de1f559058be07d8d22d69a913398d714db30d5d4b

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