Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cb43ec3f35503c…

MALICIOUS

PDF

146.0 KB Created: 2021-02-18 10:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2f6ab47bbbe37d6ec30e9661d50e0b92 SHA-1: 66d9f43ce16587de71bada6c890da956ec7998e0 SHA-256: 59cb43ec3f35503c0e93cc989ea2eeed014d087c81446131eaebfe5d36be9bdd
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing. It contains numerous external links, many of which point to potentially malicious domains or redirectors, suggesting an attempt to lure users to phishing sites. The presence of embedded JavaScript further supports the malicious intent, likely for obfuscation or to facilitate the redirection to the phishing landing 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://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/natiwozofewivuf.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://maypoin.ru/wix?keyword=ap+summer+institute+2020+new+york PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481699/normal_601ff8932e0a3.pdfIn PDF document text
    • http://midumadataresut.66ghz.com/95411859940.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/natiwozofewivuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_601be6f5f36cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406785/normal_60011832b8a54.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/joginukan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_5ff2974f9732b.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/37645113567.pdfIn PDF document text
    • http://canonsburglake.org/89845452962k2kfl.pdfIn PDF document text
    • http://crysety.xyz/libros_liberalismoo1jfa.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/1679138.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/sesafefanulokam/voltas_air_cooler_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/44881478592.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/wemadiri.pdfIn PDF document text
    • http://fotafufoka.epizy.com/basic_electrical_and_electronics_engineering_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/payroll_management_system_project_in_php.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/83907735700.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/autonics_push_button.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_off00020237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20237 5244 bytes
SHA-256: bc69734dba2d9d2f8738adc57dce666145988323c5f4cd03577a4592a0281bff
font_01_sfnt_off00021418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21418 11456 bytes
SHA-256: 7bd18861eac1da9ad6f218306344a5c430dbeebf81bd87cc4c5584f385b94432

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