Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b9503667afb3c6…

MALICIOUS

PDF

80.3 KB Created: 2021-04-15 19:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6bfaa813028ea327ba308f6897ded335 SHA-1: a97f3c862ed5d7a411fff1d649e20cd937bde1f8 SHA-256: a7b9503667afb3c60797ad10cea3e24ab00d30498683718398e8620f36f1443b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=vishnu+sahasranamam+list+of+names PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6035d86cdae5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_602a406e638ff.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/58767685069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6008b1fbbc1f6.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/5JghhhF/apakah_game_cooking_fever_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/tXjigfR/vodajetise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5fd68521a55b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_605ad429b4f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/d4Gdgec/jozinekufo.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/voligem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/electrolux_vacuum_repair_shop_near_me.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/exercise_knee_pain.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/manually_install_python_package_in_anaconda.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/42468566235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef77bc91-59d6-4e1a-b55a-8175eb52c951/plan_de_negocio_en_ingles_traduccion.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_fd9bf824ee8f4f599a17ee4f39ffb4e2.pdf?index=trueIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_6aa6fa86ca164b089dcb08c5c0db7de7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7a756e-1010-4eee-9638-798ca4bb1b19/lirepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0261d7b-c56c-4f5b-8530-ff916e0cea29/how_to_use_transfer_paper_for_vinyl_stickers.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_140e235f06774ea680c41c9851ca52e8.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_964e48d2bc3e4ee2bceb73e65cd55525.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9ce8c4-b6e0-48a4-9585-618de66e93f4/43816431011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3271febd-4fbc-4203-81cb-60d07495ab40/nook_hd_plus_battery_not_charging.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_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 4972 bytes
SHA-256: f9ffef3c3e18df697d472856159775f64349d15e026aeea6bc497a8636ca32a4
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10528 bytes
SHA-256: f2e4e79d3e7426f2c88995bd87b06c5ef5a61b768c1ea1afa2716099727ed7f9