Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b8464002f017e5…

MALICIOUS

PDF

78.6 KB Created: 2021-04-08 08:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 690333271b64fc699c1393b23188d717 SHA-1: b1de3487632bd89e3d0d5171c4198e18fa4aca1b SHA-256: 28b8464002f017e58a3c9f80ab2a8c6eb1bf727c7726ae18a596e9f015933281
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is used to host numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=ww1+study+guide+answer+key
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5fe70ee61e8fc.pdf
    • http://jizerigozigalav.getenjoyment.net/apnea_de_sueo_tratamiento.pdf
    • http://jifarobajis.sportsontheweb.net/92689953922.pdf
    • https://cdn-cms.f-static.net/uploads/4488137/normal_6009df642805a.pdf
    • http://sosiwawivijomo.scienceontheweb.net/asciidoctor_themes.pdf
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5fe785637ff98.pdf
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5fcc029ea8da7.pdf
    • https://cdn-cms.f-static.net/uploads/4409093/normal_606360ef678ef.pdf
    • https://cdn-cms.f-static.net/uploads/4453336/normal_6016697190011.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_602e2aa94069d.pdf
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fd651dd171eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_073ef9877139463985d2b96dff20d071.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47f3d948-ef40-4336-9868-255b583f1d6e/the_crown_netflix_trailer.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_6e2d4c885a7e4f108137564cb48501d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b3fafd6-3741-4abb-8b5a-ea6b88f3c3f7/36606635012.pdf
    • https://s3.amazonaws.com/xoxaneral/what_was_in_ancient_greece.pdf
    • https://s3.amazonaws.com/fejenijovekozu/football_manager_mobile_2019_logo_pack.pdf
    • https://s3.amazonaws.com/lupuvogotog/bike_running_lean_or_rich.pdf
    • https://uploads.strikinglycdn.com/files/ef9e43e4-01b9-4517-838c-336552a9fad0/what_are_the_effects_of_climate_changes.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e799.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 2900 bytes
font_01_sfnt_off0000f1db.bin
28ce7b219be68f87ea81bf12399b59b5e8dc8a94e95b1e19df70595d9844c001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 5284 bytes
font_02_sfnt_off0001040b.bin
21e3d4036983791199086c1147640588c3f57903de0b880caaa3d862bab25b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 12368 bytes

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