Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80603caeb83d317…

MALICIOUS

PDF

87.0 KB Created: 2021-03-02 13:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3315663353def42440d9cffde8e62303 SHA-1: 3885e9616f3a3a44583500ae92da95f1e6fae925 SHA-256: b80603caeb83d31711138d7b9105abb94e285931cde5892c4f6046c058e7c226
186 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external links, many pointing to disposable domains, designed to obscure the ultimate malicious destination. The primary malicious URL identified is 'https://soxebez.ru/strik?utm_term=dusk+till+dawn+sheet+pdf', which is likely part of a phishing or malware distribution scheme. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://soxebez.ru/strik?utm_term=dusk+till+dawn+sheet+pdf PDF link annotation
    • https://kotemuzever.weebly.com/uploads/1/3/4/8/134884044/robuxaz-xapejafegokadaf-jekutul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fd1da49b008b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6010e3cd46f2b.pdfIn PDF document text
    • http://afracheat2.xyz/microsoft_outlook_for_mac_free_2016satsc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_6018a0fccee00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fec3a704e693.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ehbFgfE/61492875833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600b6261a713b.pdfIn PDF document text
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/6555d11f391ca.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/jezixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_600dc9fca1ac2.pdfIn PDF document text
    • https://pizupunaj.weebly.com/uploads/1/3/1/4/131406403/0994cefec55cb22.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/tigovatolis/95285799577.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/weather_report_yelm_washington.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/readworks_answer_key_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/rukadaregigifikesom.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 10888 bytes
SHA-256: f66dfbf097e828744b597aabaf2139cda0190f06b780b5d068dd61bc019b6968
font_01_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 5188 bytes
SHA-256: 4a84dea5b52220b85dce0be90221f02c121c8a626a5a57428a86b2eee7ff5fb1
font_02_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 11760 bytes
SHA-256: 995ae3c09668015e6bfe85ed5dca5c239b93bf519057c09f1fe5942e5136f84e
font_03_sfnt_off0001394d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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