Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aed6ff3c051d55…

MALICIOUS

PDF

88.9 KB Created: 2021-10-09 03:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 137db389969b8789e05751fd93089ff0 SHA-1: 9952ae3939b142b313c12b732854bcfa5cd71c92 SHA-256: c8aed6ff3c051d55ea0363bfda629bb33cff68c504d70cba9bb217c096c82c3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are heavily obfuscated, but the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

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://kdesignuk.com/userfiles/files/xepeputof.pdf In PDF document text
    • http://tk-weld.com/images/library/File/97898733896.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/ronime.pdfIn PDF document text
    • http://przybyszewski.org/image/file/80189522617.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/1172130641.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/9936276427.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/77431060329.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc48eea43---77766894703.pdfIn PDF document text
    • http://zaiger.ru/img/file/vumirosezulaj.pdfIn PDF document text
    • https://electroagro.es/pub/files/93988194985.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/pinisem.pdfIn PDF document text
    • http://neowork-rh.com/userfiles/file/rafuzozajimiz.pdfIn PDF document text
    • http://teachatapollo.com/file/44342414619.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210912235848.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/91315659459.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/71710192365.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/jizifujeduxijasinibun.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/teludekegekomepenolosep.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/62886555877.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/57521090119.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/japedekokiwusenofedi.pdfIn PDF document text
    • https://fototipia.hu/files/files/46164683536.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/soxewogulepuwe.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/30558130073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bses+meter+reading+complaintPDF 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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 20628 bytes
SHA-256: 66be42203e95abf788f7c85485addf1868460a6bb2437284cc531fc7cc5aa688
font_01_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 10908 bytes
SHA-256: 300a590efc7f8c11357e5454f476968488e58860c535bf3e13f4cd56d666bdb2

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