Malicious PDF — malware analysis report

Static analysis result for SHA-256 855174362776eac0…

MALICIOUS

PDF

91.2 KB Created: 2021-03-04 19:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b45acf67505b05c0651d54fafb1dcda9 SHA-1: 2b79bf112c5181788638846f6023b05abcd72357 SHA-256: 855174362776eac08d4ba1727b4702ae3cc9787de0cd758fc21f1bbb4498295c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=what+is+choose+your+own+adventure+netflix
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc182e5b-4e0c-4b4e-abfd-680ea799ac2b/sazuzatotup.pdf
    • https://uploads.strikinglycdn.com/files/eabc183b-088a-48e5-8807-3c6859585bff/arduino_nano_3.0_schematic.pdf
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_1a20339bd9ef4301a8a802534cdfe76f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a83eb8e8-3ea5-4ead-beb0-732dc558626a/memories_bring_back_lyrics_meaning_in_bengali.pdf
    • https://uploads.strikinglycdn.com/files/8658b2ba-57ca-46be-b459-cf58bded0c15/korean_grammar_in_use_advanced_audio.pdf
    • https://s3.amazonaws.com/tazibabebamep/tizemobav.pdf
    • https://uploads.strikinglycdn.com/files/06c0df8e-a779-4c86-920e-6e2f9764a493/how_can_i_see_who_tried_to_log_into_my_facebook.pdf
    • https://uploads.strikinglycdn.com/files/0092e352-a17c-4640-affe-45e99896c2ab/44335484191.pdf
    • https://uploads.strikinglycdn.com/files/3b3ecca5-9021-4628-8118-efc145ebb953/cub_cadet_ltx_1050_drive_belt_routing.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_7ca58d9afab74d82a6f11e557a9d025c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fcccb272-042d-4193-a0b8-fc15e06726d3/how_do_i_reset_my_heil_furnace.pdf
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_299115570b1448b3a39c1e2467e8a0d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6862078c-b711-4961-ae46-6ad15df805ce/crossfit_routine_with_dumbbells.pdf
    • https://uploads.strikinglycdn.com/files/07fd3735-8348-4a8d-8040-a26b324d03a6/situwekeborewen.pdf
    • https://uploads.strikinglycdn.com/files/e2606fd1-40c8-4150-bbf5-3b1948232dc4/faferifunazajoxu.pdf
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_f9df5831e9c44bdcb94fc3be577b1813.pdf?index=true
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_d44cc03b6e844f81ab38414381da6b11.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1b52572-736c-4f11-8509-5ec7416b7675/waniperabipipefe.pdf
    • https://s3.amazonaws.com/xedewofuretujo/nologikaxesimewutosodebij.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_cd0f7f5f2c1041c0b70c7c1c798d7c66.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9917396c-bc23-42d4-8af8-8d4d65ba3091/integration_of_1_sinx_cosx.pdf
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_006178ef0c114061a19f041f5e76e38c.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://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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d38.bin
8e8d1cfe1a7e3a55362a3f07bf38edb73e7d0c7b525cef238e8e94df3644e20a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 5444 bytes
font_01_sfnt_off00012fda.bin
6f4530a9388446ced57745eb7b429d56d5a976cdf803b38ece73b4cc55070b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 19052 bytes

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