Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bd9bd71d919544…

MALICIOUS

PDF

153.6 KB Created: 2021-05-04 07:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d93a099dcfbd8ddcd163910ee48cf70 SHA-1: 74b9f527e451833dff7e84bf2eb0b90bb8469472 SHA-256: e5bd9bd71d919544408d10f7c7a5208acf8b7e08ec5c2401f26e7ca04cd80d34
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9981

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://midufefew.ru/strik?utm_term=what+is+so+special+about+krispy+kreme+donuts PDF link annotation
    • https://lelorovosa.weebly.com/uploads/1/3/1/0/131071021/8702612.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/3220271.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/hgjajaG/teamviewer_quicksupport_macos_catalina.pdfIn PDF document text
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/lapivejesaboz.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/4gceJI1/pepitexuwoxefa.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/Gha8y2e/juwotejixajunukedoxiwuf.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/a8a1723bafe5c.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/2a053a60-08a1-42c7-b5ac-3546764203b4/warcraft_3_reign_of_chaos_frozen_throne_cd_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7086546a-4361-42ac-a91d-852f2ec06498/10927542126.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_ca15b749963a4b0b930b724c29353c8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac23c4df-56fd-4ec6-af3c-bfa1b53ae31a/the_vegetarian_butcher_products.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e2b117-1ef2-4fbc-9db6-310a7f91a0dc/how_tall_is_manny_heffley.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_b51763e1a96542bcbf0d6eefaaa3daa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6f2b95-4184-4933-a461-a3a7960e3150/duxalorigofanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d8b61e-dd34-46e3-962e-4f4ea9f4ca61/netgear_wndr3700_als_repeater_einrichten.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_798aebd5e5f141ee902882b805531933.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3108b251-0731-47a8-b729-c24bee3c9ac1/what_is_the_best_gym_equipment_for_home_to_lose_weight.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_038af8146fc94ac3aba845516f7e5e67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c097d86-f2a0-4249-9d46-29f065a77082/28054613899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501616b3-5cf5-400d-a717-e905f3163b4d/what_does_well_wishes_person_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c402ea95-f1af-4acc-9e1b-b051797975a8/bash_script_command_line_arguments_flags.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://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.

FilenameKindSourceSize
font_00_sfnt_off0001d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4B6 13264 bytes
SHA-256: 18299931d2b8b1a239b00d16e817b8ef0e3c747a95b691f702d0f1aaf595e356
font_01_sfnt_off0002008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2008C 5632 bytes
SHA-256: 6d923b1f8e6b0866ece1316e10e63f9450c87c92b20ab4b7af03ecd8f2c88392
font_02_sfnt_off00021396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21396 14308 bytes
SHA-256: 284a01d0ddd75b58ec10dee80b3185a33e6ddfded330e239c966bd045af4d5ef
font_03_sfnt_off0002412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2412A 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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