Malicious PDF — malware analysis report

Static analysis result for SHA-256 977cfd2c57d52c03…

MALICIOUS

PDF

158.5 KB Created: 2021-03-24 23:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb43f2ef1579a0ceadbc6999defa3251 SHA-1: 93d0e1118b56496368a91a545ce094f8872a01a3 SHA-256: 977cfd2c57d52c03d61ece1772c9c3549c8cfb1e80d44ded3a711d3d21ef69af
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gimoguvi.ru/123?utm_term=android+game+development+tutorial+android+studio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446027/normal_603da559a12e4.pdfIn PDF document text
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/a79ee1f.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/8053175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fcd339f1f9b2.pdfIn PDF document text
    • http://bachanalytics.com/nixadigegokopclkjy.pdfIn PDF document text
    • http://hs-life.ru/replacement_lever_handle_fits_delta_monitor_shower_faucets2n1mo.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/vugesidiwew_fifir_jokesuki_nalanezipero.pdfIn PDF document text
    • http://hook-up.fun/newurobowuxeymr6f.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/1a0732f6-a6aa-482a-958c-a16dad52d501/cal_osha_standards_for_construction_and_general_industry.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_73d2bbfae50a4ea2b1c044f74615892f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f45f9a8-9914-4202-bff7-83de22301b42/can_undocumented_immigrants_get_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a234c9d3-99ff-4699-b838-73f4f37d5086/arduino_industrial_101_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9efd527-31f4-492b-ae1c-b46275d0defe/pride_and_prejudice_1995_episode_2_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39d3e91-c056-484c-b3a6-93488f5b34dc/med_el_sonnet_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c61e08-c5f0-4095-8a0b-898831669437/57276500448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c296f6-a71d-4c79-a782-a98c2c93456c/system_verilog_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72be05c8-9240-4361-a29f-8be4a59b2a89/60156146961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c48b4b6-e89f-4d72-82dd-ffb0a0647c12/24856731002.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_fd392d3b75d1452c97f9b5f408b55429.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f03c033-6293-44a6-bb21-3cfe58abf6d8/98689052518.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_off000232c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232C8 5328 bytes
SHA-256: da5ec7b32d1bd1ea8ba35b4ee987c5ff4af08457c00be96245cca43817af817a
font_01_sfnt_off000244d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244D6 11572 bytes
SHA-256: 7a55057fc72b9cd9128cf7293c3026a98298bcc7bda9744785f707f2be9c8910

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