Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bd08fc9a0a8d62…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 12:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49c67de63ec27212ded52c47643214fb SHA-1: 938fd1ef67bd8f45c5c4d3d3a731260d837f6b34 SHA-256: 70bd08fc9a0a8d6246b9199769df53889a3cdb82e6b5449f5085eb366f190263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://weyergans-hcc.lv/userfiles/file/83225668783.pdf In PDF document text
    • http://cl-metalparts.com/d/files/10530082294.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/jamepigorafum.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///35507623500.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/fotoxew.pdfIn PDF document text
    • https://quizai.com/uploads/files/bisedadafebijuk.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/vawafebalexif.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5a0f37f0f87088aaa7c73a6ce243f270/xuridekawam.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/65406448485.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003da81037---84003404451.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/xomaka.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/92674391629.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/41797609935.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/panarodofatakez.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/6333408026141a73ca9d97.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/74690643977.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/mojojuxu.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109162156076926.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/37167171717.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/kokitijefajudagesojogike.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fesipemeza.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/85869238300.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38953491150.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/pikuwazad.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/kudorora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+live+transcribe+and+sound+notificationsPDF 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_off0000b6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 10872 bytes
SHA-256: 8d7b2a2f2a3aa118b7441ee0e4ec9ded02434afc4fce50f3e3b2db7424e5274f
font_01_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 14452 bytes
SHA-256: 284e35e4a9424a49edae9debb5beb77bb48466da49a025f9fbbfbc7ecfdcf0f7
font_02_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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