PDF malware analysis — malicious · c7d059f74452caf6

MALICIOUS

PDF

81.8 KB Created: 2021-03-09 09:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 4278ea983c5029a7555fc4e0f4f73f2d SHA-1: a850f705fe807a487dca306450b9bddc84fd4e2d SHA-256: c7d059f74452caf60a76f6d42d5bd8b9edf5d3fc2653a4730a0987149f102f99

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9014

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
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://gimoguvi.ru/award?keyword=brown+bear+eric+carle+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4471996/normal_5fd6986227c1c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4387715/normal_5ff06d155e170.pdfIn PDF document text
- https://cdn.sqhk.co/janezewufaj/iBhbjcK/farm_town_cartoon_story_mod.pdfIn PDF document text
- https://cdn.sqhk.co/vujuzira/dBxkHhh/bapizeba.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413867/normal_5fd111dbaf2c1.pdfIn PDF document text
- https://cdn.sqhk.co/viwiratoposu/jbIjehb/star_wars_x_wing_game_mat.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/fa2f60c3-e426-4fe5-be8c-30cfb31f697d/how_to_turn_off_a_heat_n_glo_fireplace.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f2730369-f47c-4c8c-8e2d-08b4f42aef11/vygotskys_zone_of_proximal_development_in_the_classroom.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1bde7896-a9a2-4a2f-b4c6-6e96b6211dea/xovebewudetizago.pdfIn PDF document text
- https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_3985272c5dcf40b8bdadf756ec440c16.pdf?index=trueIn PDF document text
- https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_21fb603a8b8d4c9488c7cb50762d6a25.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/6f986a22-af9c-48df-89ad-a4817f047ffd/96221792340.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f726d01e-0b13-44ea-b1da-203576842ebb/91457492663.pdfIn PDF document text
- https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_d2be13a2a37c41c8a0afe7a41ad862fb.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/5ff6148a-9e78-4733-ba12-5b671b757f2d/tovabolor.pdfIn PDF document text
- https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_ec8fd48b447541789bd48a10a535b6d5.pdf?index=trueIn PDF document text
- https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_1073ac731df542bda5eff4587cca92a9.pdf?index=trueIn PDF document text
- https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_33a831e6214d46698e0f2c4831e0b61d.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/8dc63064-97bf-438e-aaa1-bb544a021b7f/complete_list_of_grimms_fairy_tales.pdfIn PDF document text
- https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_fee65dd00a8043edaac60299950e0907.pdf?index=trueIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8FA	2864 bytes
SHA-256: `39fa38c428f8958a8c05e779ab645d6ebe39a2f9addb277e83d5d46358a9c997`
`font_01_sfnt_off0000f32d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF32D	5252 bytes
SHA-256: `9763737635145ad58486521bac9200a89e5667b3e804e0feaa921326d32f8427`
`font_02_sfnt_off0001052b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1052B	15284 bytes
SHA-256: `18b8953db4bfc8a41f3068e5080f3dc0d9821b09cf28c8292cb0b23959661687`
`font_03_sfnt_off000134be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134BE	16092 bytes
SHA-256: `ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073`

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