Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a6514f3376247f…

MALICIOUS

PDF

47.8 KB Created: 2020-11-07 05:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 714605e09b638d9b66db7b6061a338fc SHA-1: 0b01ebc323802e68ccb680a11a76f037e661f9f1 SHA-256: e3a6514f3376247f62bf7efbf3ec98a8472867a9358db82f1e4c5b26681bb893
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://wezawitulenif.weebly.com/uploads/1/3/4/3/134338426/xutajafa_nujifewivuj_pinasusizaf.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://trafffi.ru/123?keyword=define+internal+conflict PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5f94eadc0fc0e.pdfIn PDF document text
    • https://wezawitulenif.weebly.com/uploads/1/3/4/3/134338426/xutajafa_nujifewivuj_pinasusizaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_5fa378277c193.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/sirulireta-xalogilofemuf-waxonufojew-guzulukajudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fa4b0b562cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f919309b2eec.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/sizakezifakitow.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/20613a10ff607.pdfIn PDF document text
    • https://tumupexaru.weebly.com/uploads/1/3/4/3/134333537/zujonaviw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tibazimujo468501389.files.wordpress.com/2020/11/85466090911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9df969-5ac1-4d4e-a6b9-e11516a8434c/navy_nsu_jacket.pdfIn PDF document text
    • https://midagolanar.files.wordpress.com/2020/11/niladora.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/bell_ringer_worksheets_grade_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6791 4696 bytes
SHA-256: cc809a6af36e008a4b63905ed51727d08638e334cd2688022d3d22d36de2e93e
font_01_sfnt_off0000779f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779F 11132 bytes
SHA-256: 6f5d50261d6b725d0c4fd3ae4d0ba0851e8847a5f1c829f49403c85dcea20c37
font_02_sfnt_off00009dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC7 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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