Malicious PDF — malware analysis report

Static analysis result for SHA-256 33aad2ad2b2ac7bf…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 22:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1f2d6163e03b858dd08941b6ca70e173 SHA-1: 42990073cf4440b49e19d2cb578624602e517727 SHA-256: 33aad2ad2b2ac7bff62ae86873ef7c32be9deef7e627d37ad2ddcb5a3cd75414
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. It contains numerous external URIs, with one pointing to a suspicious domain 'jumiwimov.ru'. The PDF structure and the presence of embedded links suggest an attempt to lure users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=ergomed+plc+annual+report PDF link annotation
    • https://cdn.sqhk.co/sofizagumup/iQFKjgY/trishul_defence_academy.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/kM7WjdY/90595460681.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/H0gcujc/free_hd_music_videos_download_sites.pdfIn PDF document text
    • https://gedikitol.weebly.com/uploads/1/3/4/9/134901051/tilivoxerazukijusoru.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/gdIjj30/red_heart_loop_yarn_baby_blanket.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/839063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_6eb47217fa06450a98e7e9b623af0ebd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/604a04ab-6614-4917-bbd0-b899e1b0207a/niv_life_application_study_bible_large_print_leathersoft_pink_purple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005a5d99-3fc1-4112-9090-d75d672f0177/41825590544.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_95e8c169f12143a4afbfc50ca31a2645.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/250c3fdf-1bfe-4a13-813d-cf0014e2fa25/how_to_obtain_iso_27001_certification.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_b4f3b131829d41179aa196079e349176.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bebc38b-7444-46aa-bba3-0af1733ef70a/dunkin_donuts_frozen_coffee_nutrition_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230ee823-e705-41a2-8e02-c128cf9fd998/75817986196.pdfIn PDF document text
    • https://19095d9e-104b-4983-ab45-6a52d868d4ec.filesusr.com/ugd/87ad98_f11e3b2141b040119265aa54a5bb3569.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4d6ced-b78e-43d8-92c0-33afe4c78dcb/76610929182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c4fd5a-c657-4ccf-bae4-e4ba1be2345e/hp_laserjet_p2055dn_toner_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67758e6b-2e8d-4d3b-b956-85a77cf1d823/xopisutak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89024336-185c-44ff-8b26-36b3a07a261d/23920598634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15d9ae3-54ee-4aa9-afc2-3ec41fc92c34/5286679009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/505c4661-1e73-438a-8581-b61b2d2c74f3/90608916511.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 5008 bytes
SHA-256: 16e960c7c21d67f8d0e286f7586e086e69a5b4ce76d1b8631bf827da34ad89fa
font_01_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 10836 bytes
SHA-256: 435259e470f1dc643f889b7d98d248b22259a2ff74d2ecb41a3fbd2a1e98b23a
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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