Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c133efc8a744d3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 18:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b041349d290f214c6d2b1dfa711fa1c2 SHA-1: 4c5921b267b02989c877f5a67d4508c4eb83a465 SHA-256: e9c133efc8a744d37483367c5e14126cbe84047e7d2dc1161183eceac8c62a0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://grup-insaat.com/userfiles/file/daxuwigakul.pdf In PDF document text
    • https://suma.ca/upload/editor/file/bugikabibo.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/lulebosokowiduralawiwa.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/21454793797.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc2f59381---bebevexujipesitinulukowov.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210901_1871C4FAB55C69D5.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/dojiladu.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/sudakirufapuzeleli.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/tilarazijepodexufotez.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/29551610105.pdfIn PDF document text
    • http://winso.tw/userfiles/file/fegerixopod.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/kovirigerunipabutubivovu.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/nukolemuwigodigateloz.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/1570948130.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/xebozonetalurogozadadubot.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/papugoxotexadura.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161373841c2bca---gebuvelurubumexetu.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/42197133292.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109080907002992.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/82066327467.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8571943657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=conversion+units+worksheetPDF 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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 15844 bytes
SHA-256: 8d1420fb18440a3a0375484092cfca844ae539068e67c5eb638d5014bc770741
font_01_sfnt_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10372 bytes
SHA-256: e0d98f76a3deef9f4612568c9486a35b6e406fd8434250b7348d5fa932107411

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