Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c173521ceb518a…

MALICIOUS

PDF

68.5 KB Created: 2021-05-20 18:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f34df10c4c7ae4a5661e9ecc603f48bf SHA-1: 675a72a87d8b024de92e86b78ed2f0a859da561d SHA-256: f4c173521ceb518a2c0f679d2e84ea70564d2e22092cfce01d162a6dc3929b9c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik?utm_term=prada+marfa+poster+pdf'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=prada+marfa+poster+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_605d7d92d3da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_606d5752660a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_60366d752ffff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ff7ca7b714d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_6018cd0cb1f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_6062fc67864f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_6029a21a0f2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_604e63ee75042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6043f56a2c513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ff5b80ba0e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_606a8ead202af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_60200201763a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fd77753f11ba.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/mufukep/does_the_bissell_pet_stain_eraser_use_water.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/83435176835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60eb424a-6c22-4439-bc7c-6c96221abd4f/husky_20_gallon_air_compressor_regulator.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/sofexotutagaruzijibixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776c3c0f-8df6-4e07-abab-2b1217086165/why_is_my_toro_lawn_mower_leaking_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/zozuxufapeg.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/zizafawuves.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_off0000cdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD2 5156 bytes
SHA-256: f80b321cec3b66b6fac9a4570d8c15bd7e1a34cce87e3f21bbc0fdd5966dce58
font_01_sfnt_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 11088 bytes
SHA-256: 596a7b78c0a3c7c48c55fbdca2fd696f1beb93ddf6d01e2fe7cd346878094eef

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