Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff6bf29d1bea77c…

MALICIOUS

PDF

76.7 KB Created: 2021-05-10 00:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4c77f2d81198990f1021fe0d50fde36e SHA-1: 237b7a560e8a7d70f8d348874548d3ced92a32af SHA-256: cff6bf29d1bea77cf0dbfea6760a3a699c0c052d070f2734d133efb8563fa441
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document uses a lure related to writing a nutrition care plan to entice users to click on an external URL. This URL, hosted on disposable infrastructure, likely leads to a malicious site or further payload. The ML classifier strongly indicated maliciousness, and the PDF structure contained numerous external links, characteristic of link farm abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://lozipotod.ru/strik?utm_term=how+to+write+a+nutrition+care+plan PDF link annotation
    • http://accueilcmb.com/call_full_movie_free7hrru.pdfIn PDF document text
    • http://retoxen.mypressonline.com/fosomoj.pdfIn PDF document text
    • http://hookup157.fun/58016910255orctc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446917/normal_60609d2aaa774.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/fikezute.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/KR3ifjc/black_screen_test_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/0jgywhj/netflix_account_login_website.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/jdjhtRU/73874741229.pdfIn PDF document text
    • http://cmbclientes.com/how_to_use_a_tennis_ball_for_plantar_fasciitis6v8vi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_60450db023b2d.pdfIn PDF document text
    • http://cozyplacefor.rest/40759908041rq379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_602d4a4f3c295.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/mugupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ff632e2da09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602c07b57efe7.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/austerity_uk.pdfIn PDF document text
    • http://sluzhba1.net/nunufojomarudiwuxexn1mln.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/8038254015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/92061670154.pdfIn PDF document text
    • http://zivexotafoni.myartsonline.com/scientific_names_of_plants.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/electrolux_vacuum_repair_shop_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/98500812960.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/daludakubonekubivu.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/tepodox.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/12892255951.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/43986559205.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 4804 bytes
SHA-256: da555c1681384decd916c6f4eeae2a65b7cd1c4761d8fc9bfd4d46ea1e60b0e7
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 11116 bytes
SHA-256: f43d5a4487062b9d33154e59df5d2941fbf0f8096c38084d74f96bc79b499077

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