Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b4f9952df39b0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6210f2d32f1839a9c930fd16b0edffc7 SHA-1: 179fc0c4798b3b53e7195226fd3d26f513d7d3df SHA-256: 651b4f9952df39b005b8978d67f6f12ad07e1f9614b94205bc3484a273e55150
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest the document is part of a link farm designed to redirect users to potentially malicious sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://golfvillageonline.com/userfiles/file/jaxosekosik.pdf In PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/viwum.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/wogafefiferomezikosagipe.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/4617753124.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68588063842.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/86125973427.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/vawamaxogusakasutemabewo.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/badunalemofijejafuv.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210904_681E4A6890F62844.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109060848568820.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/pisuwedirupiwizep.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/tulumekopiguluzelerewumus.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/77309256688.pdfIn PDF document text
    • https://krossi.ru/images/content/files/renijokiwifelanajag.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/53649791813.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/nozewirajebuviwon.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/63887467809.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/jozadudoxirusebopuzafipon.pdfIn PDF document text
    • https://dm288.com/slicice/file/9939219056.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/89864311280.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/xazejufowidagurepowowoxe.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/pegugikuruxozobit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bike+race+mod+appPDF 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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 17988 bytes
SHA-256: 7dd54d61d0b022d1511a7bab7c3452fb0c0c9be451bfc44566348dbfb6f12ed0
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10404 bytes
SHA-256: 5880bc8b1149388d62f8935054c3fa213ef63e2f79126df87fed4c3130934469

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