Malicious PDF — malware analysis report

Static analysis result for SHA-256 023a81c1e7d63d9f…

MALICIOUS

PDF

80.0 KB Created: 2021-05-30 00:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a52a346e79bae5e6856036f1a75a680 SHA-1: 3d70bdcf98f0b2abfbce246654090fc183e07d93 SHA-256: 023a81c1e7d63d9f6e642d4248a2d5d5766cdcc552efd5400c6eac5a0883b150
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 potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO poisoning attack.

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-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://xezojetit.ru/wb?keyword=plantronics%20backbeat%20fit%202100%20review
    • https://gujexewemozi.weebly.com/uploads/1/3/1/8/131856271/notifivoxujeb.pdf
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/27e5dd5f8.pdf
    • https://cdn-cms.f-static.net/uploads/4500183/normal_6051c69cd0862.pdf
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/punafepexaxip.pdf
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/5066965.pdf
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6031d81ae9638.pdf
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fcb6c332b51b.pdf
    • https://viwijivawapel.weebly.com/uploads/1/3/4/4/134492302/zobamava.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_602393b17e237.pdf
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/talipaguvowuzo.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/fb177d217b06b1.pdf
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6047b52df3a29.pdf
    • https://tifitafi.weebly.com/uploads/1/3/4/3/134390202/busaredowuwu-dibur-bazawuwunuziva-poxokibamibirap.pdf
    • https://wakazezoloke.weebly.com/uploads/1/3/3/9/133999839/werepi.pdf
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd6daa87d649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a363f61d-7220-4a00-aaf7-6b64828a153f/11666060547.pdf
    • https://uploads.strikinglycdn.com/files/9c65c3af-841b-4780-9e2e-0b4cad88f68c/feral_tiefling_vs_tiefling.pdf
    • https://uploads.strikinglycdn.com/files/660189e6-7a4d-4104-ad2b-2c63fcb49e39/37217805543.pdf
    • https://uploads.strikinglycdn.com/files/c4071c77-5741-4544-ba94-9bc9d808d4a3/does_my_whirlpool_dishwasher_have_a_reset_button.pdf
    • https://uploads.strikinglycdn.com/files/2b75c6d2-ddc4-4d3e-9b2b-22f48e48fce7/musica_instrumental_avivamiento_colombia.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_off0000f9de.bin
a86e0bd6099332c5ff30d6214f73c7f43e0d023a401cedc598317fab6c62189f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 5556 bytes
font_01_sfnt_off00010cf2.bin
0d56501e7a2bec15b0625815ca1e8c47b32a7ac178a3a713c9ef1f36e3031c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 11120 bytes

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