Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7afb298e9db784…

MALICIOUS

PDF

74.9 KB Created: 2021-01-16 07:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f2d536c01b1e67b4c51ccb37fa55e494 SHA-1: 23c23ef0b5799263479b18f88cae70b1c1de30cb SHA-256: 9d7afb298e9db784458a4f8fa8a46f71bf21e2c3b067c0d94068f2137e9db7c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1553.005 Security Software Tampering

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing. The document explicitly instructs the user to disable their antivirus software, a high-risk behavior. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attempt designed to steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dolevepi.weebly.com/uploads/1/3/4/5/134587457/26d47b0a.pdf.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://trafficel.ru/123?utm_term=disable+avast+free+antivirus+temporarily PDF link annotation
    • https://cdn.sqhk.co/fekigimuzib/hahbhaw/my_sprint_account.pdfIn PDF document text
    • https://site-1172875.mozfiles.com/files/1172875/gigivosejotejejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_5fba262901595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501367/normal_5fae3de8bd78e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382406/normal_600216a239581.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/26d47b0a.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/zunupudutoxafoget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fa08d2820226.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/tetazino/65434491877.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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 5348 bytes
SHA-256: b7608b324b31ed859a1551790c8b976c6ec1e789160d6a951837d2c169179c79
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10340 bytes
SHA-256: 7754570d9d00cd6d81f616bbd41d374ec84a0119a3e997bb61e25f9ff50f991b

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