Malicious PDF — malware analysis report

Static analysis result for SHA-256 78915a7691efb08f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 20:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51076487a8ce6d54cc9466c52992aa84 SHA-1: c768ad76f68c0615a3e67d40a92c55064a9e5a36 SHA-256: 78915a7691efb08fde3fd7d7d884b5ed7d2606dc29f75380ef4331f28f210e3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown URLs suggests a redirection mechanism to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etasystem.net/userfiles/files/voguwemudenurisodir.pdf In PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/wusaxosilifozenebu.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/96090553808.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614256b87386b---kivixugugewunupijasuj.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/56043640362.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bixetarovunifa.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/sulakajoxelubokepunovewu.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/44626922775.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/lefazotozalakonidi.pdfIn PDF document text
    • http://nscenter.cn/upload/files/10097029758.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/zegeviwatatatigunole.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/40503383137.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/127a30e8c4a818020b536a52eff73676/34710679013.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/89879923131.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/21266694220.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/bitap.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/42970707855.pdfIn PDF document text
    • https://t2sc.me/userfiles/62004661878.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/76540954453.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/wedasokifasaw.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/11583128626.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109140550525492.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/rijiderabaguximetuku.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/92719464837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jazza+creating+characters+pdf+download+freePDF 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_off0000bf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 11036 bytes
SHA-256: b656407073f8a57d66480f2b21c95ba9baee639e0d4d162a07f48bf6cd6dc238
font_01_sfnt_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16404 bytes
SHA-256: 75d9c67034c144d4232636a627dd6df7197adb013c88ad3ddf93a55217383c0d
font_02_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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