Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6b1f9117b72721…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 10:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc728eb6855be5328f04ddf8a91f79bf SHA-1: ebaedc80ba20f21dfc4953aee94a7cb8e7058f2c SHA-256: ee6b1f9117b72721ac0c029ee6ddcb46d0049e9037e33f29dfb44318393aedf7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/award?keyword=modified+centor+criteria+pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fe7a2c2198d8.pdf
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5fc6ac985319c.pdf
    • https://cdn-cms.f-static.net/uploads/4479678/normal_60476e47dd677.pdf
    • http://xuzerujagojagip.scienceontheweb.net/18575025570.pdf
    • http://zisuroto.mygamesonline.org/how_to_mount_a_scope_on_mini_14.pdf
    • https://static.s123-cdn-static.com/uploads/4492593/normal_60063a679727c.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6039deb710940.pdf
    • http://wedipum.mygamesonline.org/82487723956.pdf
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5ffebffce9741.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_6cfca022fa024f478648f0fc5ab2fe26.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc045124-35f6-4935-ab00-68d73c886891/kimetewikevevudaxesos.pdf
    • https://uploads.strikinglycdn.com/files/eae5a18e-0672-4352-8882-1b8fe8d0a381/political_science_books_to_read_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/5479c6ed-57e8-40f8-9263-f6e3a0496082/bamowijamokasaza.pdf
    • https://uploads.strikinglycdn.com/files/45082a61-3bcd-4c84-af4f-cbdf4dda39d8/flysky_fs-gt3c_battery.pdf
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_7fd7e263a7d24b098df931abf17697ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cfd7ed87-0d19-46ca-9989-bb0d996eb7fc/89632321394.pdf
    • https://uploads.strikinglycdn.com/files/71962f80-2fe1-4e92-ae72-f461df5284ac/how_to_use_a_thermostat_for_reptiles.pdf
    • https://uploads.strikinglycdn.com/files/08becdbd-bcbb-4f0c-9f19-f59bac7c9c1a/thermaltake_v1_vs_v21.pdf
    • https://uploads.strikinglycdn.com/files/a17dd48c-6cd6-4d20-aaa1-6d28e2c0048a/fifadevejaxibalotuxaz.pdf
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_5907db9f688c46888613e2c5515294d8.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1dd.bin
7b06e67f0c63cd55ac0f67d625e6321e94f61b2984454bd9c5c6e943e29f79e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 4732 bytes
font_01_sfnt_off0000f1fc.bin
5b77f713d6e6406f5d5a0963ffb83c6d90b2fdc84040816fd588ebb9683d4b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 11296 bytes
font_02_sfnt_off000118bb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 4324 bytes

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