Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a59fc46faeee79a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 00:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 769358b128a434e3be4e78b964c12247 SHA-1: e99a0cdfe0926274760ab26cb07937c47171e381 SHA-256: 9a59fc46faeee79a01a50ad4631465aac3206ef6ded550f370c63b8ae5b67761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=index+of+big+bang+theory+season+9 PDF link annotation
    • http://csc-vietnam.vn/uploads/userfiles/file/xojolepogotasesamirax.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bafepelezeta.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/92677724766.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/toralur.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_130757.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nulamugumi.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/17009766488.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/putowezudabiv.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/konoxemuwefolefunerog.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sevidog.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/xuzunat.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109011044123701.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/0svfhtffar0m24raaea8060cc4/woxon.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/85549094095.pdfIn PDF document text
    • http://agilesolutions.in/uploads/gutuwidigajis.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/xirepomadugofesepazawur.pdfIn PDF document text
    • http://land89.com/ckupload/files/lozovidoxululokabopor.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/7440574352.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9cb18e2a1---sotivatosujotakozizusis.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/vebidupovosawikojorixoxev.pdfIn PDF document text
    • 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 11060 bytes
SHA-256: feff7c3a1a4f99726050183202d6ed34969db66eb768a6a1ef0d486224cae0ce
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 17880 bytes
SHA-256: d284f54e4db0fdb9570a831a3e5dac20b1eeef3f602f9db895fe68f0217fde47
font_02_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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