Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1763f8856b2e77…

MALICIOUS

PDF

69.9 KB Created: 2020-11-30 11:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3d0896f218115ecc3f1879cfa529dc87 SHA-1: 18ce9ee369ad61b5b853c7c226a120f001977cdb SHA-256: 4a1763f8856b2e774b408b684f2c1a50324ddf5d21c9ca9c7306c93a8be535f4
216 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its use of a link farm and brand impersonation for credential phishing, specifically targeting Facebook users. The document contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting an attempt to create a link farm for SEO manipulation or to obscure malicious destinations. The primary lure directs users to a redirector that ultimately leads to a phishing page.

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
  • 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://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/vusojanijilaladizum.pdf.
  • 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://trafftec.ru/123?utm_term=everwing+cheat+apk PDF link annotation
    • https://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/vusojanijilaladizum.pdfIn PDF document text
    • https://kebezade.weebly.com/uploads/1/3/4/4/134479439/karewufud-vosad-wasorip.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/gadamefofinutef.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/kalunasegove.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/a07436.pdfIn PDF document text
    • https://fofaxofik.weebly.com/uploads/1/3/4/5/134521529/9245557.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/5fbce344be7cfc36344e8aaf/t/5fbf59bd4e98326c0207c4f0/1606375869506/muzuwos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d26f8cdb769c6d919da/1606372646658/97692274147.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc34ebe5147b148049d1391/1606635198520/65972042794.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4b08145a8629dca72e62/1606372104673/tudakezuxupizunebisolujo.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/calendar_apple_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/takanera.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3131f3de5e49b52ebca0/1606299954099/72631600487.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d9d28787e879896bb85a/t/5fc19d303c6ccf69f39b0417/1606524211396/xasesejuzorovoza.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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 5156 bytes
SHA-256: bc67944a6a14319ad4ad6ea48cd0652550827a07663a8f1ab3df48b4473a06c6
font_01_sfnt_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 10572 bytes
SHA-256: dd1a0ec7898770fd4d585205bc3b0f14a362439e76b9cf9dbd822dd056909355

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