Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bd1d29fd3f512c…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 05:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3104e64332a98f7925c548fd44880a83 SHA-1: 21b192c151a71ab87c4a7504411383b88c52e67f SHA-256: 64bd1d29fd3f512c90e56e980ff74084578518fa984224d3e847a92a49c6ba59
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs and the link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://qdxqw.com/uploadfile/file/xejibovamovon.pdf In PDF document text
    • https://bunian-co.com/other_files/File/15592647471.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/fesinazu.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/41325767742.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161507d333acf3---duxafubakusovozexulozad.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/favimedomuposopuvujotu.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/90215185790.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/rivemo.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/sipofe.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/tonor.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1b0018988590259cc57910462fa1f670/reberoleburape.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/vodafijajomefanusasurap.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vuxozofidujiki.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/gawofij.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/75148158194.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/51326264715.pdfIn PDF document text
    • http://cichanski.com/Upload/file/luzoloravotetagefo.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/teborumoxi.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/badimotolopowaluneb.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/kumidekofagojanutev.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/wemevevimemaxumewuregaz.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/sakagofuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+meant+by+force+constant+of+a+springPDF 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_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 17164 bytes
SHA-256: f16690407ebba682e2ac291eb17dfdb592b1c9d44eb00b106ac3de6ca7ac5d3e
font_01_sfnt_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 11128 bytes
SHA-256: 14048fe0e33f38b370defb4eb129ccd8a0d42fcdf27901e82dc2f5da9d550fa2

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