Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fbf2f9b8d526f8…

MALICIOUS

PDF

80.0 KB Created: 2021-03-03 17:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a65a7fd4046099c78a567fa2de58b681 SHA-1: 08c0eb28fffdfe61c15401a30f2bdd26eb5482f5 SHA-256: 28fbf2f9b8d526f869c13b8be93a8947eaa4eceb54e793be680c6b9c8ed5505c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=george+orwell+shooting+an+elephant PDF link annotation
    • http://xbet1.fun/26229797810r9maa.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/begikejodube.pdfIn PDF document text
    • http://ourfutures.space/11750961573gfn2o.pdfIn PDF document text
    • https://cdn.sqhk.co/fekoguwiwu/PMKsTij/xomawapobinugaki.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/hjd5jqe/mawebus.pdfIn PDF document text
    • http://tersq.space/1706440400688uq0.pdfIn PDF document text
    • http://snapchat-alert.com/84581825628pdr3s.pdfIn PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/gumesenirog.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/how_to_do_a_manual_dpf_regeneration.pdfIn PDF document text
    • http://kdghy.online/716951066182ut6l.pdfIn PDF document text
    • http://interbankdigital.com/53520081941qx12i.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/rF8hhhf/studio_flat_to_rent_glasgow_pets_allowed.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/que_es_foto_carnetqcdh1.pdfIn PDF document text
    • http://edapog.online/bivuxetuxokalilarugumihbw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefipa/biblia_catolica_salmo_91_en_espaol.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_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 5204 bytes
SHA-256: 34d719206ef027461b1fc6a0ccc07c94779c1f9462c230abce40d64b511c49dd
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 10484 bytes
SHA-256: 7b534376dc6d5ffc97c2acc1df21a31f86823a286846606287d1bd9c300f0403

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