Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e05dc7a11cabeb0…

MALICIOUS

PDF

111.3 KB Created: 2021-03-09 21:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa97da32ef24555c08625eede1f3007b SHA-1: 0db86a68482876380eadef51b67c0b9733dd74b1 SHA-256: 9e05dc7a11cabeb02a37c77a6b3bec4527398e234ace327ace32743ca9ac1cfc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs hosted on disposable domains, indicating a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests a potential for directing users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=english+arabic+dictionary+pdf+file PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445736/normal_600b739881c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64a20a2a2a.pdfIn PDF document text
    • http://winsl.space/rininijoz1yfk.pdfIn PDF document text
    • http://idealslimitaly.site/rusumilirufusexikajam40ri.pdfIn PDF document text
    • http://getliterate.online/compaction_test_lab_report4re36.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/silujemili-wodebogi.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/xozibez.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/vabumixubakanin-ledenigimowizux-verisugo.pdfIn PDF document text
    • http://www.opentle.orgIn 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/fb1b3157-7bcf-4856-9908-2b6192436be1/tipos_de_sistemas_operativos_funciones_y_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4119dc78-5cfb-4a2e-a2d0-8d88d9c32518/james_and_the_giant_peach_cast_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcda2c4d-e716-4013-bdcc-d809c02d2fb7/missouri_algebra_2_eoc_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0783c8-c417-4bc6-adf1-2e61469c0a21/tiger_rice_cooker_3_cup_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6a94b2-b915-43d6-bda0-2f5fd8a27e14/tipos_de_comunicacion_verbal_escrita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6766304-8a82-42ef-9a91-fd2aeef5467b/morunufuvuvasine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d615056c-d859-4b3d-8246-bb1d093a359f/what_does_total_gain_loss_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd8e061-fd26-480e-bbc1-093d556974f5/bash_shell_commands_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23224f75-b9f3-4317-b387-c6ebd3991066/tupabunuzotuxadixuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a13872-56e9-44b2-9c90-611ed24af604/safulurimoweniniwegufom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/293e0c93-9516-4e25-b7b2-4f55ed0b5c40/76435329488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1852021e-143e-4d5b-acb6-e6c2fbe24eda/star_trek_the_next_generation_books_reading_order.pdfIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013aa7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13AA7 8636 bytes
SHA-256: b47a42ebf7a04bb31e774e8b5a03d12c75356a915ffffc7aa3a285708f6265b3
stream_006_off0001786a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1786A 30560 bytes
SHA-256: 50aa470a3b27009edf9c618b680d1246eb583aa408fb8c1156ba7c0a589c14b4
font_00_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 11216 bytes
SHA-256: 0eb75cca53dac99867969c4f004e6d23ad85222625ddf4214830dab73ef4d937
font_01_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 5616 bytes
SHA-256: b665db4d81380d7f95a95f65b525f979923f32d5988a1ecd80282f8d6b163517
font_03_sfnt_off000152ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152ED 11088 bytes
SHA-256: e843447c63be3ed49fe9314a09b0747c640630f88637d3e18166cd9f6181efcf

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