Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4097ec936e40724…

MALICIOUS

PDF

53.9 KB Created: 2020-11-06 21:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7e9fdcb3e56a6d3d6236280cc64bb768 SHA-1: 620ffae2427b0df74bcda40b56c492c6ea75c359 SHA-256: a4097ec936e4072404511914c558993c6e5af6458a65da5cb531651a36e90f80
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://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/pebodina.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://traffset.ru/123?keyword=momentum+worksheet+answers+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5f92ca766f8f0.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/pebodina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8983f9605d2.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/divosesojaled_jesiwelugefi_zurovagef_nukaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://waxuvemuxibi.files.wordpress.com/2020/11/96186662163.pdfIn PDF document text
    • https://vejokosaw.files.wordpress.com/2020/11/tesipodo.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/wasenobijoj.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/best_class_for_pve_in_world_war_z.pdfIn PDF document text
    • https://xixoxuf.files.wordpress.com/2020/11/assassins_creed_brotherhood_how_to_unlock_all_lairs_of_romulus.pdfIn PDF document text
    • https://tobaluli.files.wordpress.com/2020/11/67241933335.pdfIn PDF document text
    • https://lulagapo.files.wordpress.com/2020/11/68624631580.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/50475273509.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_off00008a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A98 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00009492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9492 5156 bytes
SHA-256: 26208f3e697c293b5466a6d5b5fcb2ec5e25874e0eece7230f89dea46d4d1d1b
font_02_sfnt_off0000a60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA60F 10172 bytes
SHA-256: 4acbc5b0cf1ec05083bc51a8bd6352e441c103acf5a6055cce2a1f87ada66363