Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7159eff83884f1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-19 00:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fc72cc1fa8be3de6b9f6f316f355d66 SHA-1: a964497a9a3a11818079456b1af6748ef071ecb5 SHA-256: aa7159eff83884f1ebe97af646bedf5b3c9bfeb8f5127f3e4f0700010a2296b1
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, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zenkatsu.dk/files/guruxukumi.pdf In PDF document text
    • http://vladekoservis.ru/files/mugidulixopumasuwuguda.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/98895909645.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e008e1f009---ragenofepilu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/29679867714.pdfIn PDF document text
    • http://dsraxys.com/uploads/lokokavibowuleluginisew.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210909145220.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/fafipokafebe.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/70739002977.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/kirigexafowipaket.pdfIn PDF document text
    • https://yifff.se/userfiles/file/12363995274.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/50861347395.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/vapozebepakexiwunakoma.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/34185501965.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/momabawidu.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/19226882237.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/misemupolajo.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163159091444412600446.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/zibamodudazubuw.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/88038446658.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/46054383253.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/nifogajixesivowipixejofo.pdfIn PDF document text
    • https://edarky.net/data/file/gepofojudubufevakokira.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/11861919579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=8000+v+bucks+save+the+worldPDF 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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 18224 bytes
SHA-256: 09fbffca7fbe0a3c2c86b450d972bb4140b813c2e35e281deaa2e77f81efed6d
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 10988 bytes
SHA-256: ff16e79a825a8d7f38a5286a38265629d07db384a80d3e53c779a8d0a0b87bcd

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