Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c665f9109b77312…

MALICIOUS

PDF

77.0 KB Created: 2021-02-18 21:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4799b3209765195f22a3fd5eb9d09730 SHA-1: d23670bf40c51c42a066af25230b3e3ca493f3e7 SHA-256: 0c665f9109b773124f808c5a472b6026ff06ec00eed7cf87663f4bd70196ea4f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect the user to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=the+chronicles+of+narnia+%2528film+series%2529+cast In PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/185e9ff8dd49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_602787009882f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380211/normal_5fdc9656c06d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475853/normal_5fcc256a8c274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_601b00ecf0711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_601f75e6603c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timikawimi.rf.gd/mobogenie_uptodown_android.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/68608220891.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/50978294537.pdfIn PDF document text
    • http://mepudizik.rf.gd/what_does_the_book_of_enoch_tell_us.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/kiwogigopitex.pdfIn PDF document text
    • http://vejabimumen.epizy.com/queensland_tv_guide_hervey_bay.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/fozirezezokuxibumat.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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 5224 bytes
SHA-256: 47f1c1720712c9c9b89ff2499a4de88392c89dff9747d0dccd935b055e8682b9
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11452 bytes
SHA-256: 7317abd4c54ee97b20d428973db96a30295bf84ffce65c378ade0f67340d0e1d

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