Malicious PDF — malware analysis report

Static analysis result for SHA-256 d106a273345dbec8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 18:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 426705322fac59c8ee0faca37ba8abae SHA-1: 6e9fd6fc7e93a5217f9b5709c050adce407976d4 SHA-256: d106a273345dbec88d644850c5473e733aef3300b548943f23c9dbfbc23f4294
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to redirect users through multiple hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nslogisticservice.com/userfiles/files/nimepen.pdf In PDF document text
    • http://www.gonouvellezelande.com/files/22406456219.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/gubowejunuwirewevabunibip.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/82740805132.pdfIn PDF document text
    • http://0048.pl/48files/file/14354214117.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/forazogokufafawa.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/31749701230.pdfIn PDF document text
    • https://totounited.com/contents/files/kesikivagosuw.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/19115167489.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/49768230559.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/2439551760.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/vilidusoratovukegex.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/85977743205.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/zinipedenodase.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/46157799347.pdfIn PDF document text
    • http://prosquash.by/data/28663256014.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/34915804559.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/5956017776132ece642df4.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/lijabizafugulemelixow.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210918010526.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/zinusolubolezon.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109040902563259.pdfIn PDF document text
    • http://tykhchem.com/upload/files/zikezojogonu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/64370441282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+kissing+booth+full+movie+download+300mbPDF 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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 11440 bytes
SHA-256: 5ccba862a7b5f38d08b9808e6aae5103945f41ccdeb24def4b1c631cee8598b3
font_01_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 18000 bytes
SHA-256: 39b13644c91fdfcf3fab4b9149a8284053c3d03b7b3075aac09db0ba897935f6
font_02_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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