Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebae6454682dd52…

MALICIOUS

PDF

74.4 KB Created: 2021-04-06 22:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 480fb669ff3b4f5b80076d0774ddf076 SHA-1: c9f6722b037600b42e143635537761443b14da6d SHA-256: 0ebae6454682dd5234a1629c5b064bef5b60ff541441f67242f8bdda8e051509
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 as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=guided+meditation+free+audio
    • https://cdn.sqhk.co/xufuwejaxe/jj5hd2K/kenanugiwowideladasijuw.pdf
    • https://cdn.sqhk.co/vabolepibe/hjibeum/lagu_bts_terbaru_offline_life_goes_on.pdf
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/3838061.pdf
    • http://povulofi.mywebcommunity.org/lazatatoguzifuzofabu.pdf
    • http://xuxikanewojolaj.22web.org/arbitration_and_alternative_dispute_resolution.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_600a5363c449a.pdf
    • https://cdn.sqhk.co/jimumakevaji/ibtGZge/5274168214.pdf
    • https://cdn.sqhk.co/kozosorole/Y3QYigl/pubeforuravaf.pdf
    • https://cdn-cms.f-static.net/uploads/4485313/normal_60625c4f0d77a.pdf
    • https://rivagusej.weebly.com/uploads/1/3/4/2/134266472/1708311.pdf
    • https://cdn.sqhk.co/ruxunafifu/tCyjbqI/nba_2k_mobile_basketball_apk_android.pdf
    • http://busowalukifejel.22web.org/are_water_heater_elements_interchangeable.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd915d3b4a83.pdf
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5fd2d721cbc51.pdf
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/taloxu.pdf
    • http://felagem.getenjoyment.net/cubs_2020_tv_schedule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pekesapawej.epizy.com/avengers_game_for_android_phone.pdf
    • http://regusew.epizy.com/blockchain_explained.pdf
    • http://kalesas.rf.gd/21765498906.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fd.bin
deb9e5df74b46040f16c12636da41220fee28b3f0a400dc2d801e0a2e6f5238d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 4872 bytes
font_01_sfnt_off0000f879.bin
2b886428f1d3cf9a580dc20d487fd9d23d923b5145456bed39d162abadba562b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 10860 bytes

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