Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda6f3dd285662ac…

MALICIOUS

PDF

85.2 KB Created: 2021-03-06 13:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f282bf1da90e4b2433f934052175f8b4 SHA-1: 13703eb8c41e49149bfc89a6a2e212768d1ba4fe SHA-256: eda6f3dd285662ac4d90aa2f8f94b7597e19edba990f07a06151b05eb9af489c
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 designed to appear as SEO-friendly content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=powder+toy+online+unblocked
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fd5fbaf13aad.pdf
    • https://static.s123-cdn-static.com/uploads/4388279/normal_5fdf64eb71a15.pdf
    • https://cdn-cms.f-static.net/uploads/4486523/normal_6019bab64501a.pdf
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fdfd2d629d08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_9dc5a39ae9e34d399e06a39e27acb843.pdf?index=true
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_6478da417a5f47d1b67537a5cce7678a.pdf?index=true
    • https://s3.amazonaws.com/sowewazulejewi/30939497454.pdf
    • https://uploads.strikinglycdn.com/files/cec4af89-0d2e-499b-a81b-50a5142a1437/what_is_the_five_pillars_of_criminal_justice_system.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_cdd3c003299f4aa5831a1e9524424cb5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/faf9e7e7-260e-429f-94cf-0c027a00a568/46407748174.pdf
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_14b7031605ea4a3d9a9283a8d66dfcdb.pdf?index=true
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_f9471523b978432996092d9dc76129dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92c27333-f982-4bc8-99c7-980109399b12/how_do_you_calculate_motor_efficiency.pdf
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_33dda5dd8d9f494bac0f14c5d2005b02.pdf?index=true
    • https://s3.amazonaws.com/pipaneku/communication_attitude_test.pdf
    • https://s3.amazonaws.com/jazofi/identifying_sedimentary_igneous_and_metamorphic_rocks_worksheet.pdf
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_4738a27c10784cfd893b982058abd0b6.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_bf1041212a4e49039429b21353772834.pdf?index=true
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_156f4ec3efc645f087bf46dd17362b8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d04d220-cdce-464d-b174-6de755daaae0/kepamupuwaf.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_ec9531dc435d4056a341e9b88bb16d8f.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f0.bin
947ff969d071fd0d7bdb8e1749a508fc40e06b3899de408d505c9fb0f2ef7a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 4772 bytes
font_01_sfnt_off000102f3.bin
475730422ba1eb41f216b531898618fe1aec04173f72c1ed94e71ad3fec9f7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 4944 bytes
font_02_sfnt_off000113ee.bin
8a65916afef7672d087d322b5db774f3a5fe3b03403c757eba0a8dd7d8eca494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 12092 bytes
font_03_sfnt_off00013b11.bin
ab0b30550c16f0218ea180a56450acc25083be48fb805cb0f6f475dfa13b8319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 2832 bytes

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