Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04d671c15ad70db…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 21:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ff0e5dd37393c39bd26945d86425f079 SHA-1: 6864ec76384945e3d26fa46870192812f8eb5838 SHA-256: c04d671c15ad70db346785d9ffc9fd8d2fdac1511a107b99d442efb8b90c26fb
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=discrete+mathematics+and+its+applications+8th+edition+solutions+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6023f069d2edf.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/sketchup_pro_2016_license_key_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_6056ad427d8cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5ff688a9b7d31.pdfIn PDF document text
    • http://osthondroz.com/soccer_world_cup_2014_finali4mgo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5fda8bc615bb7.pdfIn PDF document text
    • http://rezltml.xyz/88440721244asdzf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_60263e2010602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472206/normal_5fe533ee0e1c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_6021239440ec8.pdfIn PDF document text
    • http://1xbet-registrat.site/moguxezelabekivutijexidrmic4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5ffe5ad96c1bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fe0bd59cdebb.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/bncc_ensino_mdio_homologada.pdfIn PDF document text
    • http://fakaripeti.xyz/mamixexo2impq.pdfIn PDF document text
    • http://meetraisins.club/quotes_from_the_book_365_days_of_wonder6iw8x.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/aeac2297-96e7-450e-85ed-900b66328e47/the_importance_of_being_earnest_analysis.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/atomic_theory_and_the_description_of_nature_niels_bohr.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/kakugerikabebiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab0b905-20f5-4271-a280-cefb0edf2ae6/49a_miguel_street_san_francisco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9875e3bd-567b-45b5-bbeb-1983bc1d41e6/te_amo_mi_corazon_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14149ee-d5b7-4859-95cb-09c9510000bb/lenovo_t430s_memory_upgrade.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5588 bytes
SHA-256: 3dbbc3f79957509401b43853d22fcdc1946ab8399bbe24fb3f6160d16b168089
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 10968 bytes
SHA-256: f59b7f3dfbdd10cddf3fb4dd9df23efe21c79702d919f13e55986a3f79f638a1