Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef5cd787ac115a4…

MALICIOUS

PDF

70.3 KB Created: 2020-11-21 09:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0bf0be868edb8316069c631484cd609e SHA-1: 1eed63b2fcc337d0513d8e78cd9a06ef91a179f5 SHA-256: cef5cd787ac115a433ff6dc97a6481744f2726039c41af24aa5e031160ffbc2f
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing campaign impersonating Microsoft. It contains a mass of external links, many pointing to disposable hosting, and one specific link identified as an action link to an abused redirector. The document body, though heavily obfuscated, contains terms related to 'bloxburg donation discord' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure document designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zifuxiwow.weebly.com/uploads/1/3/3/9/133997311/4074054.pdf.
  • 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.
  • 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://trafffe.ru/123?utm_term=bloxburg+donation+discord PDF link annotation
    • https://zifuxiwow.weebly.com/uploads/1/3/3/9/133997311/4074054.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/c9b58.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/jivukok-domoxanusazek-ziwinot-bosap.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/16b0b948d2e71.pdfIn PDF document text
    • https://viwizabodug.weebly.com/uploads/1/3/4/5/134509287/lepoluni-nixifa-witiz-jujegamifuxemug.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/c5b68d.pdfIn PDF document text
    • https://xitijamovul.weebly.com/uploads/1/3/4/5/134590087/8e0270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/mar_caribe_mapa_coordenadas.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/rijejexirigepevanato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbd6b5e-17f3-48ee-8e38-c1d0a9a510b6/77679268806.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/vibisunevatikevelo.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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 5364 bytes
SHA-256: f1c0f9c8efd3106fcfaf139cd8cd2b8a1c34fd97dcb36ca13ba0d23ecaa27608
font_01_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 10304 bytes
SHA-256: dedd84991ef513527e1d031f97f12787c454ae6fbe922a1e78b206ab18417e3a

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