Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82815799cdfb9d4…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 15:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5a94887125261ec3680977fcf546a1d7 SHA-1: cff15af22f249d5ea6135b58dce2ff0faf6474b0 SHA-256: c82815799cdfb9d4cf1fbbb4b8f13727560426122bc9451df1d9a6e4c076d35d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of many links suggests an attempt to direct users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/wix?keyword=jedi+sentinel+disciplines In PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/jiverinezabuzosa.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/sazobuxuxek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_600077c5e3b95.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/kuraxojubuli.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/KaheggP/53002054625.pdfIn PDF document text
    • http://topitoxituzoju.iblogger.org/baby_names_boy_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_6023bb5f04fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_602310b93e9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/jehagpp/1536121998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_602876a7a7d13.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/9zNvaia/51498354879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_602df06f9aec5.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/4248712.pdfIn PDF document text
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/zedugatopotixeneveri.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/votifipojedegisuzonoba.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jeogijg/zozovakugiwas.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/elements_of_design_definition_proportion.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/6038566.pdfIn PDF document text
    • https://cdn.sqhk.co/sapekuzob/hj93ibF/lokozerozegixoxofikufuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/aa76ada7-058e-4df6-b4e6-a03e889ce771/bamagezowomotugofar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e2aab2-13f9-44d2-b65a-1cadbf823bc1/temil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb26bb0-4284-4f13-9a40-f67a61dbe0a8/dish_network_satellite_tv_installer_technician_job_description.pdfIn PDF document text
    • http://gilebufamefaf.rf.gd/nolaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c29ffeb-ae19-4615-864c-74922062deb6/lodazasol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2783e49-08d2-497d-a899-73b2b5b8c037/22317549656.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 4428 bytes
SHA-256: 5b3d605b816a34d59f9cc8c110f6fc01c5cae4069603dd0c741470eccef6da13
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10564 bytes
SHA-256: e67ae36b23c20f3a98b786715e7be71dd53f78158eece3fb4dabd5240de15f95
font_02_sfnt_off000128dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2