Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9da9c6fcfaec3c0…

MALICIOUS

PDF

72.7 KB Created: 2021-02-27 21:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 389a1aabeb8c7f8651c35c6074606308 SHA-1: e03ca18fb44a757adb316bcfcfeb28edf96c1e94 SHA-256: e9da9c6fcfaec3c016c6287fd50cf12ee40b6327a07774effa9f82d052f4e734
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to be a lure related to generator noise reduction, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=how+to+make+an+onan+generator+quieter In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5ffbca67326f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_60362692b0e25.pdfIn PDF document text
    • http://policyhelpcenter.com/carols_by_candlelight_2018_melbourne_tv_guidefucoq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fcd04bcc457c.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/walusuvesakifatix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_602c1f625cf95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_5fda8b543be83.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/galozurejegapagid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_6001ff964f125.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/rekawexuretowo/jorej.pdfIn PDF document text
    • http://fisejotigu.epizy.com/45468379825.pdfIn PDF document text
    • http://demiwadipojaz.epizy.com/wuriwesujutivaw.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/fijofi.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/penguin_readers_level_3_notting_hill.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/the_circular_ruins_setting.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5036 bytes
SHA-256: dc20f06f628f0843a6af0b07aedf3181d950edfc571da6c08583e03916886319
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 10160 bytes
SHA-256: 2ec2b7b1419dd80c048acbc1d6f96c0128fc95308d92b8444aff6574abf2675e

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