Malicious PDF — malware analysis report

Static analysis result for SHA-256 d193933a989cb45a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-28 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f3829ed97f5266aee95be404c56170c9 SHA-1: e69041d7da449d74bb977c18119a65dd34f440da SHA-256: d193933a989cb45a4757e98f95662a254a17b093da9d2b47968bec47becc3967
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one to 'pelibifir.ru', suggesting a phishing or scam attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://pelibifir.ru/award?keyword=el+imperialismo+economico+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5ff47d213699d.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/3269249.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/8886218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501037/normal_5feeef25a0615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_6012b1db14a60.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/vuzusixovogevomanepusa.pdfIn PDF document text
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/4bf2618ca8606f.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/jhhdejO/51298047740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_603f174d7d34d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fff98c200dd5.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/Wngdlgi/niduxukogopowavukes.pdfIn PDF document text
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/7b5bf05.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/configurar_router_linksys_wrt120n_como_bridge.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/dunebiguwaj.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/gukisone.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/fuwawibu/goluviduxovudurilonewof.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/78710847142.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/myndigheters_skyldighet_att_informera.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/fadoxu.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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5256 bytes
SHA-256: c605bf79205e5696237ada457db36cab80774bf1d7089e50238e54d387282b89
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 11604 bytes
SHA-256: 041bdcdcb94b2ee7f401d4e070bd820a25eee6f778ed4d9f57ba2cd9ee8fd3c3

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