Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39c88d87952d90b…

MALICIOUS

PDF

79.4 KB Created: 2021-04-10 20:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5bd188713798c480627d9e29433a1872 SHA-1: eead13aedc19dd66e3e28f5a3fd6ecedbdc9cc32 SHA-256: f39c88d87952d90bd776ef45c648b9fa6a9ccf983354dbf21acea0afd847a0a8
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'vilenefex.ru', suggesting a phishing or malicious content delivery attempt. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of links, likely for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/strik?utm_term=game+of+thrones+book+6+winds+of+winter+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5ff0018c57b3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480389/normal_5fe39fa4af4db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_604aa2dd36755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_6032102072ba0.pdfIn PDF document text
    • https://fepirajoruvizu.weebly.com/uploads/1/3/4/3/134311883/wubobokuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fcef66fd2bbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421969/normal_6005746abcf40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_603d899e39212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fcb9ba437f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_6066efbc9f202.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/najejesasuni-pejasafiji-wofureke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_6062e692742e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_fb345f2002d240ffafe271d6012d59d5.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_4047edfe23ca4b55afff9524b4417231.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_35a5ca5e006a4b7299ea1a89c169691e.pdf?index=trueIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_e81bea46bd71470a8b70eb923b1cd7b6.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_ddf557e0aac047f8816cbf6bb48a3b1d.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_39edd4773b064cdd8c3be9698b7bc0c6.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_57d18a087e7b4b5f8aff32e7f9375412.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_2fddddb4a12545eaa46c9f03ebeaf8cb.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_8691a13dd39344c3aa8bc85c7b50ac18.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_89b2d4248afa410d9472a54ff0fd23fe.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_cae5a4a279bb443c80352323a11ef5b2.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_0ed98c11972b416288f7024b0c1eb02a.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_13b1f8506d3f4b059f3d0cfc516dde18.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 5628 bytes
SHA-256: b969a64555d44b101139e69483eb18762e5a1c27599664db352c0fb1974a2ed7
font_01_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 10792 bytes
SHA-256: 6816ecead38535f9ed71a542ba1fd03b5db775870697af366aed7d65e4258039

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