Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3201fcaaf4af9bf…

MALICIOUS

PDF

71.2 KB Created: 2021-02-19 09:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 44fc0a346ac0aa1dba9e2f243eb68ffe SHA-1: 9a7c7b540b9866d3659c1c0cda1d0c1bc0efe657 SHA-256: f3201fcaaf4af9bf620ccb337562bebd821cfbd9a73d9ab8f3378542c81eb92e
66 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=stalker+misery+mod+guide PDF link annotation
    • http://trells.space/18086742066o8489.pdfIn PDF document text
    • http://apsdd54gfv.xyz/rawosokilatupoguf77e5r.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/amazfit_bip_watch_face_ios.pdfIn PDF document text
    • http://martans.space/98413252279t9lj8.pdfIn PDF document text
    • http://eduha.online/fixasoxofipewex7emtr.pdfIn PDF document text
    • http://frut-tree.site/how_long_does_it_take_to_cook_roast_in_crockpot_on_highql01g.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/wuvumavawuj-tavilapakilefop.pdfIn PDF document text
    • http://digitalmicroteter.xyz/speak_by_laurie_halse_anderson_audiobookm1ij3.pdfIn PDF document text
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/9031774.pdfIn PDF document text
    • http://martans.space/829732100478yhmu.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/bovawovi-vafake-bevegonuno-zapajib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefujexomige.epizy.com/jomunidulafufaza.pdfIn PDF document text
    • http://saveluvuwu.rf.gd/imperialismo_siglo_xix.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_off0000db02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB02 5412 bytes
SHA-256: 8903094e8d2d84bbf6b7973fff6104d884c40465190841fff7ede290f4cd87ca
font_01_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 10240 bytes
SHA-256: 62c576b8622c955f95dc0fd0b81ce03a144182d7217f3bd8c602e0eb5d77e84a

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