Malicious PDF — malware analysis report

Static analysis result for SHA-256 0caf57935d3a6e55…

MALICIOUS

PDF

76.6 KB Created: 2021-05-31 07:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f9060deb9875250be1cabf97ed444e1 SHA-1: 2225a4efd5e82a51f32dd567cf17eb98334525d6 SHA-256: 0caf57935d3a6e5592b35d3a0d5bbaede6a9012b6380fb9c086051872fa95843
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, with one specific URL being a potential phishing lure related to 'Sims 4 activation code'. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=sims+4+activation+code+origin
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/cdd5ac9a0d.pdf
    • https://mubagaluzab.weebly.com/uploads/1/3/4/8/134874300/lovirat_vimimabafijodaj_nibapi_pemafalaseza.pdf
    • https://cdn-cms.f-static.net/uploads/4456999/normal_605fbf3581caf.pdf
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fed805fe1462.pdf
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6062217af3bd2.pdf
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fdc1e7bd3890.pdf
    • https://cdn-cms.f-static.net/uploads/4465400/normal_6046a3a77bac7.pdf
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/261370.pdf
    • https://static.s123-cdn-static.com/uploads/4392472/normal_5ff1bd07348ea.pdf
    • https://cdn-cms.f-static.net/uploads/4409411/normal_603613703ec31.pdf
    • https://tefawizudarezuf.weebly.com/uploads/1/3/4/6/134640126/dedubotutero_wopudopew_koforametisog_tabitapasajutes.pdf
    • https://cdn-cms.f-static.net/uploads/4487381/normal_603938d6379c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ac1b2e4-431b-4fee-abc8-cb575ad59e9c/simple_molecular_structure_covalent_bonds.pdf
    • https://uploads.strikinglycdn.com/files/e0acdbbd-a4d9-494a-b68d-91eff3902c65/zazuwafixefejilonilod.pdf
    • https://uploads.strikinglycdn.com/files/d319ba2a-069e-4bfc-ba70-58728f0002eb/reset_drum_mfc-7860dw.pdf
    • https://uploads.strikinglycdn.com/files/e243b4a7-16b1-4222-90d9-54c9b947178c/nasubolalixobibenaf.pdf
    • https://uploads.strikinglycdn.com/files/a424dc19-d28e-4a87-9bb5-d7583fc741ee/the_book_of_life_apology_song_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/50b66244-909e-4ecb-9acc-05daadd792a0/braun_series_7_790cc.pdf
    • https://uploads.strikinglycdn.com/files/385c9214-9f16-439c-845b-133a93ab24a2/barbie_moda_mgica_en_pars_pelicula_completa_en_espaol_youtube.pdf
    • https://uploads.strikinglycdn.com/files/e4d29395-4c08-4a32-a729-ab787c724875/what_is_the_best_panasonic_microwave_to_buy.pdf
    • https://uploads.strikinglycdn.com/files/82657c21-c130-492a-a788-caf6a4709ff8/geometria_analtica_e_vetores_em_ingles.pdf
    • https://uploads.strikinglycdn.com/files/5ddfcc45-ce3a-4cd1-92f3-439b2d2040f1/the_martian_book_summary_chapters.pdf
    • https://uploads.strikinglycdn.com/files/6f180175-cff5-4644-bbc0-f33a14c3c759/livro_angola_janga.pdf
    • https://uploads.strikinglycdn.com/files/674f79d4-d852-4722-9950-7982c7392c3d/ativa_10_sheet_micro_cut_shredder_review.pdf
    • https://uploads.strikinglycdn.com/files/9a7a2613-d91c-403c-bf9d-caa84fc0f7fc/95_tesis_de_martn_lutero_descargar.pdf
    • https://uploads.strikinglycdn.com/files/dcf11bdf-ae8b-4e20-9c92-cf601ae59602/32650668480.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbb.bin
596fde3cfb01b51f989c6b59046db36b0826c952f8254e3ea7e424c098d40636
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 5476 bytes
font_01_sfnt_off0000fe4e.bin
018f8af666ac1d934eb06eba6ede612c1f94333cbda36525bfbb5f0244177d33
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 11520 bytes