Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbc63dccf685fbf…

MALICIOUS

PDF

69.6 KB Created: 2020-12-17 01:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f4ab0f7638bbac608db327bd9d1448af SHA-1: ed2256afedc86d81111af60bfc68ecaf7843e3ed SHA-256: bbbc63dccf685fbf361508c8ba1fe99e4412d579fbf3661ead43770034c4f321
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that lead to other PDFs hosted on disposable domains. One of these links redirects to known malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=rosa+parks+speech+outline In PDF document text
    • https://venipasor.weebly.com/uploads/1/3/4/5/134584053/tepat_xifuzopin_nilimimanotul_rabekilewurofud.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/nuzefimilaxat_wokeg_sekurulidij.pdfIn PDF document text
    • https://murenazomof.weebly.com/uploads/1/3/4/0/134012525/6987113.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/kejegusi-kojurutita-gepaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5faa4e81d6e08.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/d64f443f90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fca9f341b90b.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/medaxivojoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fa2477550134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc052d83dfdd95b60d21819/t/5fc0dafa3c6ccf69f37db448/1606474490749/harry_potter_clipart_black_and_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8366460b-96ae-44c8-ade8-00255f5c51db/ready_math_book_grade_7_2019_answers.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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 5092 bytes
SHA-256: c11f1d38129a5ef18d10ca3712def78745e9fd2b8649ae6df44d151615bbb54a
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10596 bytes
SHA-256: 7c95dbbe398298cbc2aaa4d603496ffcaaef7d5843cef3768b53ea269c30c8f1

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