Malicious PDF — malware analysis report

Static analysis result for SHA-256 af079d2a01f307b7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 00:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0ecf2a9e7f6e5279bdab85ab5a65c12 SHA-1: cb7542ee27f8dc7fdf5b0c28529be7491bf18924 SHA-256: af079d2a01f307b7c7ebbc4f26559849cbbfb8710d3a8c1227ca4846e3fd66fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The embedded JavaScript stream, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests this PDF is designed to deliver malicious content or facilitate phishing attacks. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acm-medicali.it/userfiles/files/78702669701.pdf In PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/30463880624.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sofunowevusuwirejenagofat.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/xinotetep.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/gosuwodekafidipene.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/77159490312.pdfIn PDF document text
    • https://cartolmania.it/file/31174531182.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/fanemabojosew.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/25234207565.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee69219f---bowegewolo.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/47512694429.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161410e4376718---63292546037.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/tubupagor.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/82817316403.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/1472317011.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/42250529128.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/fubevoxidukimolimapukoti.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/79719466741.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/xelamadafomutugidexesas.pdfIn PDF document text
    • http://chinalabware.es/d/files/kixurudotawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+9+antutu+scoresPDF 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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10800 bytes
SHA-256: 9381a8b18bf90a038685242253a303acfe1e7f63ae117d89f376c83083bf69c0
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 19012 bytes
SHA-256: d9cb6c275dbbc83bf20c33e6e1748e3c14b6b03f41e0e37151efe702c79f8c8c

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