Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdcce4b3dfdab8c…

MALICIOUS

PDF

92.3 KB Created: 2021-04-06 16:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3f87623a89765cba22d7de254df67b4 SHA-1: 1f7ccf9affb6dc1a65ee1a47cba5034a330d6fdd SHA-256: afdcce4b3dfdab8c8e6f908cde98aebd14f4b0baa26169baf86a21dcc8b8103a
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/aws?utm_term=garmin+740s+transducer+bracket
    • https://cdn.sqhk.co/jopubelo/97m43hb/divaz.pdf
    • http://weinmvc.net/digital_marketing_job_interview_questions_and_answerscq2mf.pdf
    • http://oneitstore.pro/fomadumosow9fv8.pdf
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/ef8f3c1af842.pdf
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/biwidasame.pdf
    • https://cdn.sqhk.co/jasurisunav/1ijxGjc/universe_sandbox_2_download_free_windows_10.pdf
    • https://cdn.sqhk.co/tiruxugajo/GY1bhhD/metropolitan_fiesta_5_theatre_santa_barbara_ca.pdf
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/zojivow-wedirofedekizev-pepubavufepos.pdf
    • http://winoorama.fun/tekavirovaxulunadvurxu.pdf
    • https://gukudobubutagen.weebly.com/uploads/1/3/5/3/135306914/be4b6.pdf
    • http://center-about.com/vavikididijeg7ja9t.pdf
    • http://help-copyrightservice.xyz/tadebirudovivusevinuzuaysdl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_7512a51271724750b00823951586b181.pdf?index=true
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_096bae217dc04c469920e643101890f6.pdf?index=true
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_4b92304a3f614e6ca57dfc162ef5b8b4.pdf?index=true
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_1a54ee1225ad429a9a4499ea4dc79c54.pdf?index=true
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_82696a537a93437fb2a09e44ba9a8403.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03443088-8bff-4d04-979b-6c2eba58e257/91171876788.pdf
    • https://uploads.strikinglycdn.com/files/8f25f84a-299b-4b98-8b71-8f136de7bbd5/54363406693.pdf
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_5063514552ec448a8d147e77899a738b.pdf?index=true
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_cc9888b36c3f461c85c151b4316816a3.pdf?index=true
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_70b129d0e92449bab85d782462623503.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a0bc30b-f824-4901-900e-ce3e1d2a5af5/nisulivewelujekorujasep.pdf
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_cb258598673b4a9eb83c8013ee9db637.pdf?index=true
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_24b210d8924f487fa9a8f13499a484ee.pdf?index=true
    • 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_off000126ba.bin
dee929c5853d26991250000317c516b4d47eafdf2235e4348588b988b8d0c2d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 5596 bytes
font_01_sfnt_off000139b9.bin
1a03ff9a825c175644ee6bb7a54895bcb189c149ef0900d57a0ceed59cfbfd51
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 11948 bytes