Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a18d0863c3b529…

MALICIOUS

PDF

92.3 KB Created: 2021-03-20 12:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 12608084c2f67a91d5754b2caac651b9 SHA-1: be2e9701c2eb5973563e4412af04f6b690ca3e4d SHA-256: c8a18d0863c3b52989b0f0803c644101a88805fe0297aeee04e5ed92d586c74f
186 Risk Score

Malware Insights

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

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 0.9996

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://midufefew.ru/strik?utm_term=how+to+get+rich+felix+dennis+pl+pdf PDF link annotation
    • http://damodudajipofem.22web.org/sony_bravia_tv_ing_apps.pdfIn PDF document text
    • http://tryse.xyz/formation_aide_soignante_cours_du_soir_bruxellesyfw7f.pdfIn PDF document text
    • http://stroymarketmetal.ru/pt_cruiser_transmission_fluid_checkhht1i.pdfIn PDF document text
    • http://hs-life.ru/trig_identities_proof_worksheetssovd.pdfIn PDF document text
    • http://sikufitunowapon.22web.org/darikekudadugowezobop.pdfIn PDF document text
    • http://ledy66.net/lista_broadcast_whatsapp_androiddht7v.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://uploads.strikinglycdn.com/files/86bc2dd8-d4a8-4bbc-977c-060d17ffacc2/how_to_change_file_size_of_photo_on_macbook.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_0a7b74813c7848869791794f69453a5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc05117-a87e-434f-8daa-cfa55b7338cf/fukisadoxomutozuxitusel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b831e815-4797-4ee2-8d6a-293b4cccc17f/85377208174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cd3b72-a311-4323-9ec3-a02a60dba14d/aviation_boatswains_mate_fuels_job_description.pdfIn PDF document text
    • http://revupeponalewuj.epizy.com/curso_cutelaria.pdfIn PDF document text
    • http://bimomog.rf.gd/angina_pectoris_guidelines_2018.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_98637c0f04ec4a3aacb6c4b7cff2c3fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f239242-96f0-44a5-9c53-1e3817923123/muluvoduvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09a24c6-26d8-40ca-b85b-029fca99ed9b/66294937281.pdfIn PDF document text
    • http://sozogakuvigoxev.epizy.com/dell_xps_9570_hackintosh_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e541d8-345c-4221-af6f-b6b05d9a0ae9/difference_between_viral_and_bacterial_infection_in_cbc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090a04e8-ad0b-47c2-af83-2320eca38ff0/59237433992.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_c5a91e70db2a4eb9ba7f9b3e0fdbdc82.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_15c2f68811f64f7d80ebc0f3d840b378.pdf?index=trueIn 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_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 5116 bytes
SHA-256: 52f27d35e0d7fc005f079e52afe0b6c54bdf39099098fe35a8648b972fc91da6
font_01_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 12572 bytes
SHA-256: 9557df55450eca095114e753ce613c17032c57462d7e60aea14daf6b9c755d78
font_02_sfnt_off00015398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15398 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34