Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e7402128aede2f…

MALICIOUS

PDF

74.9 KB Created: 2021-06-12 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cdc1164c216ff4e919677a2388ef9e5d SHA-1: c587f2f427ebad7c90fd60295397ed9c686c8501 SHA-256: 18e7402128aede2f6c9b82273a4943ab3dcd1602aad75da7cf54a17336fee186
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one pointing to 'smidgel.ru', which is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF acts as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://smidgel.ru/pbw?utm_term=independent+variable+stats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5fd66400dedbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5ff52a5143f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387931/normal_600757b4b2d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60c253c55e4f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_606e960d16eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_604016fa465f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5fd275a55b8a4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4501495/normal_60b6ebe0f1753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jubujefaj.pbworks.com/f/xudenunogunidawudome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cdc6a4-abf4-4e77-9383-b7b500fd2700/3487525338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2838aa-ec74-47ac-998f-c3156813b6a5/ffxiv_aetherial_wheel_personal_house.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144519993/how_to_fix_no_sound_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7467f049-8dae-49c0-a727-da27d1530762/wubifafod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f17f348-e95a-46e8-b7f9-8540ace24b4b/panasonic_kx-tg9582b__2_kx-tga950b.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/razasukopopepejolug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8394a8-cd89-458a-b8dc-56a42a4ddda8/62655698102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e835d800-0795-4cc8-8f16-7cb55f6502b2/hoover_dual_power_max_carpet_cleaner_fh51000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae5b32d-06e2-4c94-94e5-cbf48bdb4645/download_photoshop_gimp_gratis_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ecbed0-c453-43bf-ac2c-b78444c5eca9/dell_latitude_e6540_charger_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07377af-a3bd-4694-ba1e-490f784006d8/14458663786.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144981582/3d_flight_simulator_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9284d1-028f-4c19-b02e-15ddfe0a7bb9/sound_blaster_z_review_espaol.pdfIn PDF document text
    • http://kemususi.pbworks.com/w/file/fetch/145096434/sea_of_thieves_free_download_android.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5092 bytes
SHA-256: 00f904fa686fdd6d0f40d9324f221fd137973e3adb6d3a07671319778a71af4c
font_01_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 11644 bytes
SHA-256: d19cffbddcf1fb9dc9dbe1d717db25876406025d1776ee93d2cbe6aba8fed36d

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