Malicious PDF — malware analysis report

Static analysis result for SHA-256 351d79055f32f8ee…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 88172a9260c5e3c848cd2c9642296d68 SHA-1: 52b7638c85f7ebd5cbac3933b7fe0dbb9a70fe72 SHA-256: 351d79055f32f8ee7cda8e8fe889f75bfd3660af36ec2499e77b77816feea88a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=the+spoils+system+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410462/normal_6024f82572bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_604dbbe8384d7.pdfIn PDF document text
    • http://doucheapp.xyz/54732530368ehhyi.pdfIn PDF document text
    • http://milanbeach.fun/dekitagesuzofuji39uwr.pdfIn PDF document text
    • https://cdn.sqhk.co/xurilopotun/hcwia3y/excel_2016_spell_check_protected_sheet.pdfIn PDF document text
    • http://urolog.xyz/nituvazaxidaganuliwe5gdnx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5ffff9303c8ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_6007e4d714d43.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/gjhjihe/splendor_in_the_grass_quotes_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/zigFAij/34908915460.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/ijcsIgg/tawanifumunezuwakopilu.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/iaibijo/amazon_prime_movies.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/ranifuwebymkdi.pdfIn PDF document text
    • http://instapriz365.site/versa_lite_not_synchingbs6r4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_600011db9b20e.pdfIn PDF document text
    • http://thepropheticapp.com/badosarazrzim.pdfIn PDF document text
    • http://magazok.top/putakawatly7r2.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/haa0Blp/87783121036.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/4hihdfE/89604163619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_80012bcfc1c542ee9752450c1a6e6ff4.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_26babe2f932c4e959e5698abf8d18b95.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_e242dc12e7654c53abce237b3989ee36.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_3482dee46ca34939bd5af5b5e0e4057c.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_37335ba315534772ba713cb028351d4b.pdf?index=trueIn 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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 5028 bytes
SHA-256: 734fa4c1cba60229c8793352250eca897e6ff4a1f61f686caf47186b87ce2bed
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 11356 bytes
SHA-256: 7d3a5aabfa03128438bbfa10fc03c85dee2e697898edd575d64fc84c107954e4

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