Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5baf5fa0da1355e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-06 02:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c64e8847cef6504325e598b36ab971a8 SHA-1: 4432662a399cf473d11f9725da8f36a286930d26 SHA-256: f5baf5fa0da1355ecef698196392a5e0c7a82213fce89dbfa1b47fd03c204441
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though partially corrupted, contains text related to search results, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/award?keyword=bpsc+prelims+2020+result PDF link annotation
    • http://rumurel.mywebcommunity.org/clifford_the_big_red_dog_books_online.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/zuvevalorene.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/31403906274.pdfIn PDF document text
    • https://purotuduveb.weebly.com/uploads/1/3/0/7/130738796/bevewodilatidiboki.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/1832576.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/how_to_reset_filter_on_trane_thermostat.pdfIn PDF document text
    • https://gapidekejoz.weebly.com/uploads/1/3/4/8/134876705/5802117.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/26778055492.pdfIn PDF document text
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/vadasot_riwumo_zozavorin_vimem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_3218f8882b154bd582133f536e935b20.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_4ef5c47efcd847e98b68e89ea76f2e1d.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_a2375c76e148442c8d8b8af7a903054c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d921027-9801-428a-852a-ce08fd8fc3e5/facebook_help_desk_number_uk.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_de87c5968c9f4d81b98f7cf81ed111fc.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_6e1e087d1aa844aba9278ab873fccaa8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1deb89d-da38-4ce2-81e9-54ef7e2ad8b5/kauai_road_map_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263b5782-2901-4266-a5e3-dfe148ab41f2/allowable_bending_stress_steel_sheet_pile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c70d312-386b-424c-beb3-1b3822252a9e/71327140316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126ebce8-4259-4013-9b17-3d0ef34296e5/ruvoxemaxirozuvunojuvudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c058e22f-01eb-483f-bfe4-1948832d06d0/75178990356.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_bf14b50db3a64463ac4d8e3676c862b5.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_a6d122d882e94e87ae5fcb58224fd645.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_b4048681cd794bcd8575c92f491fdbff.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_10e1a3e2ee9b42c0b6821bc57d40c450.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 5192 bytes
SHA-256: d0079994e7fae7c73745d84ad9f61d95070669d85a4c1ec4e66abde9926bca0a
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 10208 bytes
SHA-256: 3cf15acfc5c89526d7151498a7806b79fd41c38defcadae1e2baaf72c8ba9378

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