Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a75982673f2602…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 01:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 810a1a8a212ef35cd8bc42a0c34205e5 SHA-1: 9e565b4f81cedde8671ae2d5a5953f4fc68a2c6f SHA-256: a8a75982673f2602faf183c838511cfe008249a3b06760d2375b235d8e578b2d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, directing users to numerous other PDF files hosted on various domains. This suggests a phishing or SEO poisoning attack, aiming to distribute malicious content or manipulate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gmart-express.com/demo/uploadpic/file/20346105665.pdf In PDF document text
    • http://bellina.pl/userfiles/file/bulaxamamikefejet.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/zopijufotusizuvekij.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/difasukofakimodofubasorom.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/kunav.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/mepudipatuwezi.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/345647975.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/96622603930.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/fesavebofaxulojorolitu.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/10199383697.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jegewegiso.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/luduruniset.pdfIn PDF document text
    • http://mq-water.net/upload/86875528595.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/79395236051.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/9719469522.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/famulemeto.pdfIn PDF document text
    • http://geotersrl.it/file/85215342456.pdfIn PDF document text
    • http://asfalon.com/__files/file/87407314138.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/63841272076.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bdc81eec9---kajaxa.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fetikosarejokiweb.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/96153019435.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/52408011151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+pattern+lock+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_off0000b4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 18556 bytes
SHA-256: e0013c118d50f4b6052c1ee9eae1e4fa73682ae90f6f4529f2e13d96462e7c88
font_02_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 10756 bytes
SHA-256: a1a29a2e953f0e70217883dc9b1c5457033fcd5e6a125113f486e6e9c9e35f4c

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