Malicious PDF — malware analysis report

Static analysis result for SHA-256 db95aee44f5455c2…

MALICIOUS

PDF

97.7 KB Created: 2021-09-12 12:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aa55243048109285fc642885b79a8178 SHA-1: dc428c547fa485fa65ad01c7833c942a3ea18017 SHA-256: db95aee44f5455c25810aa11cf7a5b95f74f09b792f55828d3f3eb7f6308d726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is used to distribute links across many disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hypotekaprezamestnancov.sk/res/file/25826597004.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a2001330---62438070475.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/korokokodejilubi.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/96834376035.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/71888249781.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/24457548385.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/suxexi.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/4670894543.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/72381109980.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/18797408306.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/93450110976.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/gogekafaro.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/vabefegoxufemako.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bomifi.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/xuzufafodigidam.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/padesafizer.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/tapazono.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/losujegavoruvijutepa.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906070642.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/79954942999.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/fexumelekerejezasigomoxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+board+games+on+play+storePDF 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_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 17304 bytes
SHA-256: a886ee19054e01f8b8b0b5a9735ff3d391569d6cb980292bd16933670d9da5e6
font_01_sfnt_off0001471f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471F 10948 bytes
SHA-256: 6f6c0dba15fd64eaefe9312fa81ce75d440a0b6b5587aa063a6a89176074d50c
font_02_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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