Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9a3fd175545ffe…

MALICIOUS

PDF

78.9 KB Created: 2021-09-26 18:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e229a331616475a038d31f973cc84f64 SHA-1: b44f2d0116c22f42dfe2d1ab88beae6f721de303 SHA-256: db9a3fd175545ffeda3106e5c5f5e0eab2df4d92dc3f73f384f600d88e1735fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The primary URL points to a resource that appears to be a lure, suggesting the document's purpose is to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=eac3+is+not+supported+in+mx+player PDF link annotation
    • http://amkchem.com/upload/files/rubosivajidoxumobis.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/52710601475.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613cfb1e30046.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/wumanilifibebuxewiwaxuw.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/bogumutomuwawunupov.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/takeka.pdfIn PDF document text
    • http://acril.ru/ufiles/files/78527951958.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b155f2da3---lisubexajixuxa.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210915_FAFDEE7C27A4AA26.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/forotubabovidil.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xozudasotoxetapipewokuj.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/gudeworegapuporutovov.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/2553586658.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/dukuwupuram.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/16892353881.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/30069179174.pdfIn PDF document text
    • https://uangraja.com/contents/files/73274678557.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/41518811969.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/90739223292.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/15115445711.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/46301954455.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_off0000c1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E5 11148 bytes
SHA-256: 8dcb6b135b0f24ecc8406d41fbbdbdecf9648cc75d2b7c265c291eac31149137
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 22004 bytes
SHA-256: fe070d1bd11de85b429b98a12eff5e2503cbd9a323c5d9e925eb05041fa00ed6
font_02_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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