Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f17c9aa8330ed3e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-20 03:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16effb0dc46807215ea97b37bf8231f2 SHA-1: 966fb31cfe5f5ae10b6f13cf7eb675fc061f9d5f SHA-256: 9f17c9aa8330ed3e00f156873f749253dcc426fb20a63d651d42df8fe12408d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely leveraging T1566.001 for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=rooted+android+device+means PDF link annotation
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/38527712398.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/zuzumobajatunepew.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/jutizijemixivob.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84938796256.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///romopotirapogilut.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/23713003617.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/42095856927.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vuribofaroba.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/rebalowupaba.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/radedekebovomekopadavisop.pdfIn PDF document text
    • https://raljob.com/userfiles/file/12154674242.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/82127637542.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/74524633807.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/63a248969a9eee3671cc3efb6b1ed154/4721622247.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/vagupesajivaniwufimabil.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/tasovovufowet.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/mitalobeviwafininuxubiso.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/75507197283.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/16007778895.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/pawefa.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/57053895965.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xevupe.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_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 17388 bytes
SHA-256: 40eee387cc70a77e85a9f2e00a29d62a651d362c863cd5b667ed4d299c999c97
font_01_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 10596 bytes
SHA-256: 92a21a38830a9c185796e8ad38c5bb500bd752cf3bfdc3e06e6cfb24980e8bc0
font_02_sfnt_off000141a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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