Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c6da3e7c5966e0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 07:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9cbf9e3d7df5fb75f24dffc6a24e06b SHA-1: e9fedd34aaf9435e719715d34a0d5123d7da1d3a SHA-256: 72c6da3e7c5966e06d36d0eb74a6f52bef4c50d1a5bc0bbc95dc77e292328564
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://egyptsuntours.com/userfiles/files/funinagaladixadiju.pdf In PDF document text
    • http://yh-nutri.com/filespath/files/20210903063211.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/74945615311.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sefove.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gukux.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/janiwalemasaxade.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kefizepefuzoxizogawapibi.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/3411085633.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tidutira.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/82829533555.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ec898c9abc3ff63dfadf0eaf8c6ecbfd/346415617.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/papukonezixiw.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/vuvaziwodurujutedadizap.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/nuxuw.pdfIn PDF document text
    • http://drironcat.com/images/file/sufuvafaninexeli.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/49933402869.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/58454893114.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/16846362854.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/favonetomabogit.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mejude.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/37371048724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=microcontrollers+and+microcomputers+principles+of+software+and+hardware+engineering+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/2755485307.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_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 11244 bytes
SHA-256: ae17af4c86319a71e688e07ef64a596ee0688423a12ed557f1735e881d35ca86
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 17868 bytes
SHA-256: 5006696d1e56deca90352dd8f5a8ced791491ebd1daffbc9d32842895f2416de

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