Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee9b5a2b0d00963…

MALICIOUS

PDF

90.2 KB Created: 2021-03-23 16:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cd7a456cc1fa620390787a719695e6b SHA-1: d554acd3e890db86d6cb1941dda2991cf9346945 SHA-256: 0ee9b5a2b0d00963c64629a39cead5baad16ad41221e6ae069195811c48bd733
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=age+of+war+2+unblocked+game
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/27619ebb.pdf
    • http://on-arenas.com/internetworking_with_tcp_ip._vol._1_douglas_e._comere71xi.pdf
    • https://cdn.sqhk.co/fukonovum/hbhdig2/nasazonizerul.pdf
    • https://cdn.sqhk.co/lididiregi/lhHieqi/92268648599.pdf
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/c4c4089.pdf
    • https://cdn.sqhk.co/bulixanejad/Ogch7ib/youtube_live_stream_fox_news_10_phoenix.pdf
    • http://idealicaitaly.site/27353026617mpcei.pdf
    • https://fazozojoxupu.weebly.com/uploads/1/3/1/1/131163788/ed71c41c035.pdf
    • https://sedivunoruset.weebly.com/uploads/1/3/4/8/134859312/90d1d328be.pdf
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/zifugux-mozajepad-nedoga-setot.pdf
    • http://ita-bio.fun/rorawuwumagajjnqhr.pdf
    • http://coolvdomaion.online/56918465406sckm4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9cae80e9-72ea-4e77-afb7-e84b94859b45/dirt_devil_featherlite_upright_bags.pdf
    • https://uploads.strikinglycdn.com/files/97a06737-4e2e-45d9-a9b6-cb8c18746c9a/57271932794.pdf
    • https://uploads.strikinglycdn.com/files/33b9fe75-9564-47ce-81fe-202516e3b64d/57202936343.pdf
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_87fba5136627437ab801e113a9b2952f.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ccfe68d4f12d4d648366a120756b1241.pdf?index=true
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_d97908e7fa694967ad0d0d492002ccf6.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d72.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 6744 bytes
font_01_sfnt_off00011e57.bin
cd734780fc53eddcbaaf1a996c4a8e823edfd1855e6cf18f8b1d195d574937c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 5580 bytes
font_02_sfnt_off0001315a.bin
ad8fa568cbad4a7a2f24c3f26b773934a21d24ee063eebc31511fbaae6b89065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 13640 bytes

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