Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea153239a1642d92…

MALICIOUS

PDF

77.5 KB Created: 2021-06-03 14:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 310320ada20f9faa5dbee55339dd6adc SHA-1: d1a0480371c97b9f840c9756747b421254b51740 SHA-256: ea153239a1642d929f2b7b62fb35055b6b8ad19b6617887181cd6e94fe9747c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content, aligning with phishing or link farm tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/pbw?utm_term=china+dynasties+of+power+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60230f544c6eb.pdf
    • https://cdn-cms.f-static.net/uploads/4370768/normal_601f4266dfe02.pdf
    • https://cdn-cms.f-static.net/uploads/4443617/normal_604cb5e02e521.pdf
    • https://static.s123-cdn-static.com/uploads/4424637/normal_5ff8a37e81512.pdf
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/8608253.pdf
    • https://cdn-cms.f-static.net/uploads/4417423/normal_606cba17a00c3.pdf
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/5879599.pdf
    • https://cdn-cms.f-static.net/uploads/4385887/normal_605c0506aeb3f.pdf
    • https://cdn-cms.f-static.net/uploads/4404290/normal_606e39bb25e31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7bddfa3-ac33-43bf-b56c-a54001feda4b/wopemiwalawesaril.pdf
    • http://pezeliv.pbworks.com/f/17871825229.pdf
    • https://uploads.strikinglycdn.com/files/be9594f6-8c0d-4215-bbb9-b7357ba12b23/70487893566.pdf
    • http://dejulagimu.pbworks.com/w/file/fetch/144534168/90823535823.pdf
    • https://uploads.strikinglycdn.com/files/5d5b62ef-c851-44e1-bdc9-c891554cf333/24126893872.pdf
    • https://uploads.strikinglycdn.com/files/f2ca4de2-39c5-44fd-91c9-22acdb59e44b/printable_free_printable_resistance_band_exercise_chart.pdf
    • http://xutosop.pbworks.com/w/file/fetch/144445629/fomevibajamuwexef.pdf
    • http://wiliser.pbworks.com/f/34177315090.pdf
    • https://uploads.strikinglycdn.com/files/fb1beab1-c21b-4e6d-b07c-2d4cd4cac4de/zubowonuwe.pdf
    • http://lopofemusun.pbworks.com/w/file/fetch/144529623/26317094649.pdf
    • https://uploads.strikinglycdn.com/files/87f5936d-a499-4bb1-a370-e6896c7d6f68/97242058847.pdf
    • https://uploads.strikinglycdn.com/files/94482e51-1088-4d21-a402-2fa5927a7416/rekasidefi.pdf
    • https://uploads.strikinglycdn.com/files/f3b20262-ca58-4c23-834b-8be60455740a/41973016702.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf0.bin
b67ffe2c7060d4e9222508b2c055691d37813004a7d85246c6fc9d061a5883a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 5260 bytes
font_01_sfnt_off0000ede5.bin
6f75127cf0462ec09644c5b9f57e1e4a0ac1a3db982656ab95d337496af0e495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10740 bytes
font_02_sfnt_off000112d5.bin
6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16132 bytes

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