Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8721caf2137f736…

MALICIOUS

PDF

67.2 KB Created: 2021-02-09 22:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 75377d09ca6f936b49332548173634d8 SHA-1: 1eb20e8891e906fbf75809a24c614ec20648fecd SHA-256: f8721caf2137f73653f6caaafbbf497bdd42895170b3c6fb84e15247a4bb9aad
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=bhakti+geet+video++please In PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fea35cb778dd.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/yAjgQhg/learn_to_speak_english_fluently.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fd972be16e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6015713890d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6018ebb06d189.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/18556797224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5feeb5d0524c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roparewuna.rf.gd/54770992634.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/bezibugefesovupogasap.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/present_perfect_tense_worksheet_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/nodemcu_esp8266_datasheet_espaol.pdfIn PDF document text
    • http://gefuxexo.epizy.com/buwisimewusopevabebulu.pdfIn PDF document text
    • http://sikofus.epizy.com/20747357626.pdfIn PDF document text
    • http://fusuzuveraku.epizy.com/44665718304.pdfIn PDF document text
    • http://mivuturirem.rf.gd/android_phone_with_apple_watch_3.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_off0000c8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BC 5296 bytes
SHA-256: 251d1660e10a432a736ab672a41b5a45faeba1fb4174c0d5c782fd531ce10673
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 11028 bytes
SHA-256: bfa174e1ed0b5e08135c4ead68b3bdd71f7562dff4b2f042c92d0d7af8210d86