Malicious PDF — malware analysis report

Static analysis result for SHA-256 5511b102fc2345d8…

MALICIOUS

PDF

88.5 KB Created: 2021-04-05 10:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b261e3022dcc3e6a4e61c749c11a408 SHA-1: 250162172f6731ed2b545a15115fc9ffd3b3fa4d SHA-256: 5511b102fc2345d82e5dbff9b86f37b8941b3dc155545afa3b7bc0951dac918c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ponafet.ru/strik?utm_term=fl+studio+apple+free
    • https://fifofisepag.weebly.com/uploads/1/3/5/9/135985139/a74fd15de33.pdf
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/129121.pdf
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5fceaf3210d9e.pdf
    • https://cdn-cms.f-static.net/uploads/4370269/normal_6055c4ecaec93.pdf
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/2977301.pdf
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fd046ed8223d.pdf
    • https://cdn-cms.f-static.net/uploads/4412181/normal_602728eee6e5f.pdf
    • https://cdn-cms.f-static.net/uploads/4379038/normal_604cb697d58b5.pdf
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/polasowawab-kekore.pdf
    • https://rulurutepiket.weebly.com/uploads/1/3/4/8/134881251/0b094032d9e.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_2cab333d2722484ea7a08042bf4147e1.pdf?index=true
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_5c91e2d316104105b107ae913bc7974b.pdf?index=true
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_da5892ffb0bb42d6a0bcb2ebf3fb4df3.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_f02af7ab9f5b4347aceb43b1549771a9.pdf?index=true
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_2de0ae92b615474ead768a1ac144118b.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_cee8f4de58b64645a997db8dc475784a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/853a44ca-8f7e-4711-b82a-814fb27c4bed/paige_spiranac_golf_tips.pdf
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_62ad17cb53944775aaa1f79ba6804066.pdf?index=true
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_f9c166abfba94c2eb6cc140133b7121e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2324268c-261e-4ffc-8d28-fbdb70e15347/xupugifumi.pdf
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_51bc4500e45744f1adda6d82ae72da65.pdf?index=true
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_7078bcda3ba74796a879ef1e2f0feea1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc3e7aca-6f7e-4be7-92db-1e9343dac986/home_theater_blu-ray_samsung_ht-j4500_3d.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f9fb.bin
b9971ae27ef84717de82bfb9e13dafa6e4bbeb3a70c891d3c6dc7271bdad3df3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9FB 14108 bytes
font_00_sfnt_off0000e9be.bin
726beb8142cd7b2a55642eb15bc64147fbea3e151fea70918ec09c9f9b9a09c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 4764 bytes
font_02_sfnt_off000120e7.bin
30c88b88a435e71c56f8df412e6464509bfbbf3cafd7c3a04b6e37f1942fb2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 10812 bytes
font_03_sfnt_off00014616.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 4324 bytes

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