Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb8815dbba72a41…

MALICIOUS

PDF

64.8 KB Created: 2020-12-18 11:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 26f071029cfa648294e4442b51e9b9e2 SHA-1: 70c733178b0a83decd74578a7c1d496efd545a44 SHA-256: 8cb8815dbba72a417b9d8a03792a451854d16dee7cfee743c9f107f0b4baed32
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be malformed or obfuscated, but the presence of numerous external links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=harmony+school+of+ingenuity+twitter In PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/danulogipaxujulige.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/6fa3dcc.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/fe1e84e4ca2007.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/8165859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kufazete/recommendation_letter_sample_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf00157-3da7-4913-872d-4e992acda4d6/82481541890.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a7b9084698658e639c4c/t/5fcdfb239aa2de0c64b86d97/1607334691951/plants_vs_zombies_free_to_play_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/10486880964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775a1ae8-0b01-4184-948a-0dc8ca309fca/eyvah_eyvah_3_full.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcff5dc7afe470b556d3c5/1606221662399/empirical_formula_of_ferric_oxide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedf15c9-6a24-4ccd-b29a-ffdcafabaf9a/movie_spawn_1997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace6ddf7-45bb-429e-8c76-f46be8f63a44/rod_of_thunder_and_lightning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebe2a54-3336-47f8-8cd3-4da79731cb01/gizujovevarabogixameza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e42e0b1-d6a1-49cc-8b6f-13a39f9ec4ec/78467371578.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_off0000b2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DA 5332 bytes
SHA-256: facc7628329090655e75ad3218784102d968a0d7537a7309d31a9954e13d21e9
font_01_sfnt_off0000c4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DB 10332 bytes
SHA-256: c775e83defd10f4fc2a67307cb8a3fea2fd7b3a66b11269b35ae36c5144d0ed3
font_02_sfnt_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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