Malicious PDF — malware analysis report

Static analysis result for SHA-256 508a47f15ac317b9…

MALICIOUS

PDF

79.1 KB Created: 2021-02-02 15:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d0bef4aa76a3455a5e9a3918a631d52 SHA-1: 73eb24c1619c4537bdd286c54d449e8d08c81990 SHA-256: 508a47f15ac317b9be9547b113f6d5c435eb048dae3b8126a9e5099caf6e3fdb
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The presence of numerous links to disposable domains and non-clustered hosting suggests a link farm designed to obscure the true destination of malicious content. While no scripts were extracted, the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=cal+state+fullerton+jobs+staff In PDF document text
    • http://fimosabu.iblogger.org/angadi_theru_movie_tamilrockers.pdfIn PDF document text
    • http://wivejudotimog.22web.org/google_forms_spreadsheet_formatting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_6015c4d6e0d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6018f7862af3a.pdfIn PDF document text
    • http://berkeciftci.net/zunufip9khaj.pdfIn PDF document text
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/6eaf6881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_600d92c5b5918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fdc731b27ea3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fcbe77e8b81e.pdfIn PDF document text
    • http://pubgmobiie.com/66680725492bnsah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipomivizipe.epizy.com/kala_patthar_full_movie_hd_720p.pdfIn PDF document text
    • http://tejusadesivuti.epizy.com/cisco_anyconnect_mac_high_sierra.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/gauge_transformation_quantum_mechanics.pdfIn PDF document text
    • http://xojorefalez.rf.gd/larixulenezoxirajoriw.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/explorations_conducting_empirical_research.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/sumabozibemolaju.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/joomla_bootstrap_4_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/risopitowalov.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_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 4884 bytes
SHA-256: 75e9d21b86868bb7605ae3b0660d178c5990b5f007584f03cb1d9248a3d79694
font_01_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 11980 bytes
SHA-256: 29893bd24342493e0c318de3ac68fd7d47f08652bde239ccb037cfcdda439d65

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