Malicious PDF — malware analysis report

Static analysis result for SHA-256 48798d4fdc07cc9e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-02 21:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0f93cdfd78f342e575362e8ee26a4753 SHA-1: 5c09f5d9ca8c3d10e4df17d52a83b8a53232410b SHA-256: 48798d4fdc07cc9ebe7465d156792711970d9f5a7c08d1f112eb221ace5ed718
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URIs, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to potentially harmful content or phishing sites.

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://nipisod.ru/strik?utm_term=ramana+maharshi+books+online+free PDF link annotation
    • https://cdn.sqhk.co/sewadokoka/hhhgeii/farkle_girl_meets_world_age.pdfIn PDF document text
    • http://storeeu.info/does_kaz_love_inejwe4bd.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/jeQbOii/cnc_router_plans_for_sale.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/6397035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_60223fdb44e17.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/afiiigx/age_of_empires_2_expansion_civilizations.pdfIn PDF document text
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/d52c2166d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_602ef8818cb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_6024ef32a3b5b.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/ee082d4b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipijoxog.rf.gd/84_charing_cross_road_streaming_vf.pdfIn PDF document text
    • http://forevar.rf.gd/learn_advanced_excel_online_in_hindi.pdfIn PDF document text
    • http://mivowejow.rf.gd/54898013782.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/chocolate_cake_birthday_images.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/65641430567.pdfIn PDF document text
    • http://jerasopel.epizy.com/will_directv_replace_my_remote_for_free.pdfIn PDF document text
    • http://leronusofawu.epizy.com/what_is_red_poem_meaning_by_stanza.pdfIn PDF document text
    • http://gepuxaxevo.rf.gd/23503526312.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_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 5216 bytes
SHA-256: 1b74188fc2ec4ca57d091e55e988dd26666d1169cbd77a5c422a9565e384ecb7
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10848 bytes
SHA-256: a7d31575026afcd2a0b0bd3c12c6e5e413ff05aae317a7c62ca0468a33faec73

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