Malicious PDF — malware analysis report

Static analysis result for SHA-256 db488339f3df0749…

MALICIOUS

PDF

44.8 KB Created: 2020-11-06 19:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 335ebaae5911d0324b2bf8f6e796d7c9 SHA-1: 435b1984359dc2857e720ec9ba2982ffb76f09af SHA-256: db488339f3df074966c389504702d751a46561a3f2920b37b30802f261a3eac2
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://traffset.ru/123?keyword=thank+you+letter+for+professor+recommendation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5f8fe5a444af0.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/6545311.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/rinepasadizedir-xofimo-jefivedux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5f8e4b6cc4458.pdfIn PDF document text
    • https://safikevobajegev.weebly.com/uploads/1/3/4/3/134352312/15391f.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/2275904.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/tutukasugajixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cd32458b-828b-4ca9-a346-32de14ecba54/notidajetobabevogesuxajit.pdfIn PDF document text
    • https://vejokosaw.files.wordpress.com/2020/11/tesipodo.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/kezobokodenijavexa.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/nifimuv.pdfIn PDF document text
    • https://maxekodu.files.wordpress.com/2020/11/42525849365.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639A 5392 bytes
SHA-256: 62596ae54688ea6c002f43c311b55d68526b9e62c5ab54a3ef37ff46966e6bc2
font_01_sfnt_off000075c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C7 10096 bytes
SHA-256: 2e6bd32c6e6cbcca839152fe9dcd25022bcf4c61148ebc402b121ed92cb5d4cc
font_02_sfnt_off00009833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9833 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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