Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd31658b8bfce2fe…

MALICIOUS

PDF

89.2 KB Created: 2021-03-14 04:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7abd18609708e818d53156e9a8109ea SHA-1: 6fab2c87141f0f020778bb27a4e1f48e94fdc518 SHA-256: cd31658b8bfce2fe929054e24775f7edf197405ee13f044c82e763e4a1e3cd13
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 of which are to domains associated with SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=arduino+nano+33+iot+wifi+example
    • https://cdn-cms.f-static.net/uploads/4490380/normal_603a0e6b7c73a.pdf
    • https://cdn-cms.f-static.net/uploads/4403408/normal_6030338064994.pdf
    • https://cdn-cms.f-static.net/uploads/4477910/normal_6009c6a18c5a2.pdf
    • http://wowitaly.space/19079760431atoy6.pdf
    • https://cdn-cms.f-static.net/uploads/4371799/normal_6010a3be5133f.pdf
    • http://womenit.space/ruled_paper_templateuj66u.pdf
    • https://static.s123-cdn-static.com/uploads/4478667/normal_5ff14bd0a28c1.pdf
    • http://qunit.space/bomb_squad_game_hack_apkvd9c4.pdf
    • https://static.s123-cdn-static.com/uploads/4467910/normal_60081d01979bc.pdf
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5fe2a955ef2a5.pdf
    • https://static.s123-cdn-static.com/uploads/4374843/normal_60040dba8ceae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/betefowubevat/how_to_clean_power_pressure_cooker_xl_pot.pdf
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_85f3578676b04c8bb2c9b20928394404.pdf?index=true
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_70ec873ca2e640e6b40d5484652d1c07.pdf?index=true
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_d567f4d60bcf45c49a7b6c7f4f2b4321.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6acd8f73-c082-41a7-bfd0-a28e5a03e689/guzetosimofiwize.pdf
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ab6be7f3ece54023992acafd42487b4c.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_ada1ade5277a4c59a15dd6e607cc3d0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c46d6d2f-5395-4ad3-8d15-1384199bef7d/libros_digitales_de_harry_potter_gratis_en_ingls.pdf
    • https://s3.amazonaws.com/tinezedu/7244101117.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec3.bin
fec39cf22350271f4a03e1a054e4a6dc53e134d54fd59446e8e67ad864f79253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 5204 bytes
font_01_sfnt_off0001006b.bin
de4d6777c42a9a0b9cccd4030f0599f61369bf950d554910e4eb2a9885b29305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 2188 bytes
font_02_sfnt_off00010a8a.bin
dd3317cd11cd0325c360407b18769ec313a3e36ccde6553ba94568e934d24dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 11988 bytes
font_03_sfnt_off000133db.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 16140 bytes
font_04_sfnt_off000148d7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148D7 4324 bytes

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