Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f152a2667f73211…

MALICIOUS

PDF

95.0 KB Created: 2021-03-16 01:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9d6cb38605a12926c1f8ff2fd2fd6ff8 SHA-1: b64c2394f8993b5cb4396c362793eda91fa26e60 SHA-256: 4f152a2667f7321157b1da41c6c0651debd886745309d841b3614c3bb8cbc972
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services. The primary URL, 'https://pelibifir.ru/wix?keyword=blacksmith+ffxiv+quests', suggests a keyword-stuffing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the heuristic firings indicate a malicious intent to redirect users to potentially harmful or deceptive content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=blacksmith+ffxiv+quests PDF link annotation
    • https://cdn.sqhk.co/zinumazak/jehc1ZU/election_commission_delhi_form_6.pdfIn PDF document text
    • http://alkim.xyz/fuvoromonomupuwevtu66o.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/ahbihhb/us_breaking_news_latest_local_news_breaking.pdfIn PDF document text
    • http://triple-doska1.club/tekumexidawuledomi2zdda.pdfIn PDF document text
    • http://ueuniti.xyz/making_inferences_worksheetsopxi8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_60118f900f86c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5fdf2bd1c9572.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/eibhdic/kindergarten_animals_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/VSjfZgf/reaction_trainer_for_pubg_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_602c7cd89afae.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/hijfIic/6126048321.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuzodopuvu/RhbjeeY/bivuse.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/hiXkjgI/blazing_star_ranch_colorado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xusapibu.onlinewebshop.net/el_alienista_descargar.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/harry_potter_y_el_misterio_del_principe_libro_sinopsis.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_1c15fd905f734bb889f82f040cccb42c.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_55d84097f3a44713a1439017c5008222.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_8fe222103bfe4ca3bf10db5386df8c5c.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_e307c70b18fa45b497c89268c030a00f.pdf?index=trueIn PDF document text
    • http://jekurur.atwebpages.com/katyusha_guitar_tab.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_off000134b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B2 5392 bytes
SHA-256: d51ce81477e93f13a19c27be7e71b505666dccbdfc796c2d3d148ca6faa85b6b
font_01_sfnt_off000146fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FC 11688 bytes
SHA-256: 8f4286cc48fd4abb9dfd165936a5375199faf5d9dec2598a73107387d8286ac4

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