Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc81eba513b1458c…

MALICIOUS

PDF

68.9 KB Created: 2021-01-28 20:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 89fa72951e1b7116c76697a5f02fdf2d SHA-1: d65fa4ad3b685832265601bdaca671e262217bbf SHA-256: fc81eba513b1458c88fd3b841342f99501a078170a768e3edf80121fa6492b70
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/wb?keyword=adventure%20capitalist%20download%20pc%20no%20steam In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5fffa56f4dd8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_600592797d1b0.pdfIn PDF document text
    • https://tisolalaw.weebly.com/uploads/1/3/0/8/130814234/7e59da1b2.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/ih82rIs/samsung_split_screen_apps.pdfIn PDF document text
    • https://gitarufimoka.weebly.com/uploads/1/3/4/2/134235546/tiwilirizawosek.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/gKLgiT3/kuxiru.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/hrojhlN/sodupumaduj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_601123df4b39c.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/gggghiA/amazon_echo_show_10_stand.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mejusamenubeto.rf.gd/advanced_t-_sql_interview_questions_and_answers.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/banting_meal_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/fikexezibijozizel.pdfIn PDF document text
    • http://xelidamos.epizy.com/fofoxaxavoregeviw.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/witesuwufi.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/lalusenevez.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_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 5360 bytes
SHA-256: c401c3fba79769983445e9b9862782b153d65c883a0adaa0ea3c21bee65ba995
font_01_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 10068 bytes
SHA-256: 98a9ced0cd0b121fed6433f7bd9316a8bf712cb953bded31a586b07d7daa8e4c

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