Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a67fdaef1d358b5…

MALICIOUS

PDF

72.2 KB Created: 2021-02-22 20:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c0c1cf3460973c47a15272077d3980b5 SHA-1: 9caf34e7a1ee3b7279e322e8a2cefc58f971ae9f SHA-256: 4a67fdaef1d358b5e6def0cd50b613959aedb3c92d4ceb789db88cef0f39de66
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/lexepet_zafamat_jaturotitak_mogum.pdf.
  • 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://maypoin.ru/wix?keyword=mcat+study+materials+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451566/normal_5fe53b47bb492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_6009b0c4e7eea.pdfIn PDF document text
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/lexepet_zafamat_jaturotitak_mogum.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/davomotako.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/zawanetebamujolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_602b63a39323b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5fe1c0349decf.pdfIn PDF document text
    • https://mogorabijeruli.weebly.com/uploads/1/3/1/3/131380728/7627444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_6031d2c445efb.pdfIn PDF document text
    • https://dunevija.weebly.com/uploads/1/3/4/3/134306837/9a6d3f7a03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5ffe060b20996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fe8969a7b107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_5fdc10b061c5b.pdfIn PDF document text
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/vadifisurexogud_lijid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60207b56ddddd.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/4768392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 5192 bytes
SHA-256: d01c4298a6a7ae16c0cfaacafbc3a59dfc073b7dede80aa874939bf90df27953
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 1748 bytes
SHA-256: aa8a68c1ac347c9295bd8d5cd128c5fddcba424dbb4494657646e08ab4197750
font_02_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10536 bytes
SHA-256: f7deb087b3f47c6ae848cb70a7f2d5f3b0bcb1dbfd8173bb2ad79911c0ac6532

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