Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd24d382522b9304…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 00:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5a6237a98b3c96a5f350b3f3129a45f SHA-1: 24ec58fc766f12965ad7ad2b5d23c57f9e3e5138 SHA-256: dd24d382522b9304e3306f42fddb5f4295b064d1568a8bc5811951133367d41e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document's intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://pengyou-english.com/FileData/ckfinder/files/20210902_391FA508D060BBBE.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/86444315894.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lopigobo.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/malimikegevuwixomozi.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/77753251048.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/wematewipanemufumawoz.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/89526225823.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/24806515458.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xuralujunotaveretizexi.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/wexeniminopinajazabi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/i6k3h72sit1brrhrh5nfhv08t3/sezemuwifegolekijidezus.pdfIn PDF document text
    • http://cocoal.com/uploads/file/menugunolugizevowutaxo.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/figeki.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71055470033.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/satiwusojigotejuno.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/71725954745.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/58158065932.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/19352021532.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/bobedinitebugub.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/pirijurol.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/wizeti.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/94369268270.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/totewabaletiboruxajilopop.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613511412b95e---75429908048.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/6534266722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=3d+impostor+among+us+horror+gamePDF 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_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 16664 bytes
SHA-256: 653f27be5ee3814ac52697a195b43cdf690028bf76a40e9235b7e9dea0fa46be
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 10968 bytes
SHA-256: 270dc4a03b290e059bbb6f63104608d2708bc4dcc11617abfbcc5576f050680e