Malicious PDF — malware analysis report

Static analysis result for SHA-256 59284f08e1129258…

MALICIOUS

PDF

87.3 KB Created: 2020-12-31 21:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc71560a6f27bb1798dc94598f4a99b SHA-1: 591ae594a85f0dbcf2f957ee3c3b3debd2327f8c SHA-256: 59284f08e1129258cc299864e3b232e569e4fa6d8ce818e89b1ebe6c811d2cee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://traffnew.ru/strik?utm_term=bubble+cloud+game+cheats', indicates a lure related to game cheats. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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://traffnew.ru/strik?utm_term=bubble+cloud+game+cheats
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/604672.pdf
    • https://cdn.sqhk.co/mepofazobi/hhlVicC/servers_for_minecraft_pe_1._14._1.pdf
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/jamof.pdf
    • https://cdn.sqhk.co/tiwumixe/QCiihg3/pevukepa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3eb4f456-6846-41bc-9cda-89ea3c206a44/clash_of_clans_guide_hq_3_layout.pdf
    • https://uploads.strikinglycdn.com/files/b24998ff-083a-4ce1-9ad8-2649dadeb155/jovuvazufiso.pdf
    • https://uploads.strikinglycdn.com/files/3f54b45e-f63e-4190-88e6-162021da16e7/boridaxatedetozewin.pdf
    • https://uploads.strikinglycdn.com/files/dc70792e-c34f-4f33-8327-170931672c57/msc_for_me_seaside.pdf
    • https://uploads.strikinglycdn.com/files/75c4ab19-d114-4154-88fe-6903a95232c0/electronic_protractor_nz.pdf
    • https://uploads.strikinglycdn.com/files/b9adb855-8537-4e96-8b0c-6b135147878e/31200026649.pdf
    • https://uploads.strikinglycdn.com/files/10fd44f3-24a2-4e60-9a77-d343daff614a/81709655876.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f530.bin
19d7e010ef9e220001e0013795175a472585cff042d40d92bc6615dc29055818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 5176 bytes
font_01_sfnt_off000106cc.bin
d524c955e28777e367e9187a982265b02dce235d56ca72c30a5589ffd998b289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 11152 bytes
font_02_sfnt_off00012cb6.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 16204 bytes
font_03_sfnt_off000141e4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 4324 bytes

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