Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b7ab690ce3fa5b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 01:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27677d3143986daecdd6dc52f6ebe2a3 SHA-1: 2f1d870aa07cfe7fb589c3e0e0fe650616fbd9af SHA-256: f9b7ab690ce3fa5b89cc3f78b220b0f2bf11e216a8351060cb5a10e2ece63958
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with one URI pointing to a raw IP address, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bloodfaces.de/attachment/file/40100831085.pdf In PDF document text
    • http://manpukulivermore.com/uploads/files/dakopepidufukokixogubigiz.pdfIn PDF document text
    • http://tyextractor.com/d/files/barabekolipagenobe.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gavuruzuladodozutob.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/87784654575.pdfPDF link annotation
    • http://investin-khj.ir/ckfinder/userfiles/files/74592167224.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/46504820239.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/53746116801.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/63493991488.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/bizilutavidumeme.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/aef30cea1d5332de737d1b649eed50a4/xifazutewebejipawetido.pdfIn PDF document text
    • http://keyday.ru/files/files/kubijapovan.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314c50372f8---58325995878.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/kumumifiziwi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xonalesufuluxud.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/15803872528.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/18713608695.pdfIn PDF document text
    • http://chineseclothingonline.net/File/23323113077.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/xefivuwezuzodaditiji.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/guwumabovakujefuso.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/21404941086.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/kodokevawubajowemukeliwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tv+show+apps+for+androidPDF 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_off0000c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 16456 bytes
SHA-256: da227ce816d80f20cfc2e7e00708b77f77e8bf3bb06a6c447135beb2b035aabb
font_02_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 10432 bytes
SHA-256: 0b495d8088016351c5f9b45bcf2814dcf578615febfde6d5b9a8688327a4007b