Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52d5661fb738641…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 06:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5926339027329bc9a3b696a03bfcabe2 SHA-1: d4c618b07542062c35ad56eb533d83e96e33e950 SHA-256: e52d5661fb73864181d74aac21ce2a8637383ef1ea1547b70a8d422517735049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the high number of external URIs indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://avvocato-callegaro.it/public/file/kezalisirereguri.pdf In PDF document text
    • http://kutyasturak.hu/images/files/bujotabekemanoli.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/27174741293.pdfIn PDF document text
    • http://saimiri.name/upload/file/94930670949.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/damazagapegul.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/33eec3cc91398c48c1ee868c2326fb23/88745957245.pdfIn PDF document text
    • http://tencanpowder.com/d/files/57005163410.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59701209295.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/xebenuniwonojonizono.pdfIn PDF document text
    • http://contelex.it/userfiles/files/57099136248.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/diguvixajuxeran.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/kifez.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jixedarawanina.pdfIn PDF document text
    • http://cold.lt/userfiles/file/88476731580.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/befododepororoninelelilu.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/41041993533.pdfIn PDF document text
    • http://knipia.com/userfiles/file/10456971639.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/10037336964.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/fapizis.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/90691797143.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109131257215411.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08e28f5db3bd33ef02a6de41fca521ab/pisodararirosibo.pdfIn PDF document text
    • https://toocapen.com/files/78313863194.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/14300875990.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210907_232038.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109020923198564.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/13034012159.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/vinilojofirosejejal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+remove+shortcut+screen+from+mi+phonePDF 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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 17180 bytes
SHA-256: 9b7a62158e665ed1df4099f70892ddabd9e188c10c262bef0959980ac7673cd0
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 10780 bytes
SHA-256: 69d417e126e1a595d7037567e87aabfab022aae2b8f5df480bfa5253ca6b59da