Malicious PDF — malware analysis report

Static analysis result for SHA-256 3454f8765cd54b34…

MALICIOUS

PDF

77.8 KB Created: 2021-06-10 11:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d08b8bd776364a6976b10dea2532ed83 SHA-1: c7c912da0aac71f4f10a4127c383714d901af1cf SHA-256: 3454f8765cd54b345e2863bbf376303545def527b460bdd7acac3f1e14e579b5
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/pbw?utm_term=veeramanidasan+ayyappan+bakthi+padal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5fdc7fa46dc0b.pdfIn PDF document text
    • https://gorijifezavu.weebly.com/uploads/1/3/4/5/134502749/6593223.pdfIn PDF document text
    • https://tafifomoku.weebly.com/uploads/1/3/1/8/131856516/3795183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_603e16cf2444b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_6006b87a4ba32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_6063665281690.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/neparigukamemo.pdfIn PDF document text
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/wowufefimebafobujisa.pdfIn PDF document text
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/vuzoranolan.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/domusabepu.pdfIn PDF document text
    • https://lixagomifele.weebly.com/uploads/1/3/5/3/135323016/tokirikubifetol.pdfIn PDF document text
    • https://wizuxasu.weebly.com/uploads/1/3/4/8/134876367/5031930.pdfIn PDF document text
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/tipifilad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_605ef0b6d6337.pdfIn PDF document text
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/c01383.pdfIn PDF document text
    • https://ganogajegukak.weebly.com/uploads/1/3/3/9/133999764/zakojapiweditas_dofuvodubusika_xumafaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc01c80-cc36-41db-b0e8-351e75477567/how_to_measure_a_floor_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa42c4c3-1e63-42bc-b426-b2e0fc3dc4b0/57845577817.pdfIn PDF document text
    • http://rerikisozid.pbworks.com/w/file/fetch/145028538/15608289306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6701dfe-562a-40fc-bfbb-61655b23babd/52412605611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e879b2f5-071e-40d8-8ab9-629e849d347a/under_the_dome_season_3_episode_1_sinhala_sub.pdfIn PDF document text
    • http://nivipebi.pbworks.com/w/file/fetch/144986781/bardo_thodol_download.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 5468 bytes
SHA-256: f45c7ec4c8169a1c8de7e4278fd1eb076f62fe800e968545150eae408d0f97bc
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 8520 bytes
SHA-256: 1fb48ef3030447221f4d2cb681aef565309793d50fa485c1ae59c51089f33916
font_02_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10652 bytes
SHA-256: e92042a7f3fcc52141fb9e047e7c40d8232069685ecef2a7f4efa2cf8d58351b