Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28662b72bd6df2e…

MALICIOUS

PDF

80.2 KB Created: 2021-04-20 12:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72ea980078bad97ab3b6dea277371ca2 SHA-1: 804481f0cd066404c42d658931a3cb11cbb50ae5 SHA-256: c28662b72bd6df2e8bdf2640cc0a74d5e3b4bf780725b4246d26651ddf1c1d91
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'fokemale.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=manual+do+smart+watch+em+portugues
    • https://cdn-cms.f-static.net/uploads/4418973/normal_60102bb398e27.pdf
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fe90475cea0c.pdf
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5fde1acdda0e4.pdf
    • https://cdn-cms.f-static.net/uploads/4386849/normal_6053137844976.pdf
    • https://cdn-cms.f-static.net/uploads/4366993/normal_6020cfb3bc182.pdf
    • http://sitizinudex.getenjoyment.net/1343260664.pdf
    • http://zawugudumi.getenjoyment.net/josafugukelirezix.pdf
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5fffcc7c2da13.pdf
    • http://mizifasurogik.mywebcommunity.org/hemisferios_del_cerebro_humano.pdf
    • https://cdn-cms.f-static.net/uploads/4485689/normal_600e72d6e3c70.pdf
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5feb4e6562ef4.pdf
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb14943e3.pdf
    • https://cdn-cms.f-static.net/uploads/4425727/normal_6012c5ce9cd8c.pdf
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ff4b3bed562d.pdf
    • https://cdn-cms.f-static.net/uploads/4451561/normal_60600c07e9ec3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mewabetowa.myartsonline.com/english_arabic_words_list.pdf
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_db1c6ae8b5ff4e1ba23af78c5e07e187.pdf?index=true
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_e9a2ef1384b84ee7b668aefcd1340f6c.pdf?index=true
    • http://fepetixapokurob.myartsonline.com/joint_of_two_uniform_random_variables.pdf
    • http://vawirir.atwebpages.com/what_is_on_the_2_for_5_menu_at_burger_king.pdf
    • http://fiforeru.atwebpages.com/los_diarios_de_motocicleta_full_movie.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f885.bin
d60d5b602ea0cfaa179512ef9e9eb52d917d38844938aa8718b17b318c39068b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 5584 bytes
font_01_sfnt_off00010b75.bin
9317fffc8acd518f101ae094100bd6d00bbc37462a65495dac1c041c75375690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 11316 bytes

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