Malicious PDF — malware analysis report

Static analysis result for SHA-256 40099aab33e607ce…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 06:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a84487b9d25079eb97e2d8e89020f297 SHA-1: 51cb6406f7f69c1dd64b457c29e79741b9358242 SHA-256: 40099aab33e607ce487971bb1eecb2c2d36c6767d9d7989ed3cf4b10b8624398
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous disposable domains, suggesting a phishing lure designed to trick users into downloading further malicious content. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://c-amc.com/upload/files/jideveto.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135054cc3d4b---bimonum.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/gotalapo.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/zubigetona.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/71639431440.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/babagi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/worujuvoluvitetexuk.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109160101045940.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/sudesinuguge.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/zexabawaxasejaxajexijavi.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/rudutuwirawom.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161302e863d1d5---fukir.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/96472479443.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/54235974013.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/pegoperofepuve.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/64415014209.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/koxakivafatititadik.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/59462589850.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/xumazofogatap.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/tanoboxebogogezopawa.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/koxanupogawojatimimafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=windows+10+scan+qr+code+wifiPDF 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_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 10724 bytes
SHA-256: 4165f298051bf2fe39a72bf1bd46962c19ad87a0640c4cf3ce65813491e9c4d0
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 17872 bytes
SHA-256: fa0232d1b5803e08132f5c56434eb383854d70213c01dba4c3aa141cb78fdd46

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