Malicious PDF — malware analysis report

Static analysis result for SHA-256 d227f7c90d1b2f99…

MALICIOUS

PDF

79.7 KB Created: 2021-03-06 10:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5634e7fbc46f742d63a9d13a27266d7 SHA-1: 0f0bb04b403cb2acad9269d0e21f7605387b2cf3 SHA-256: d227f7c90d1b2f99c1e3cc0b4dea0137dd3d262754644b6655a3b8f9b3d6b1e7
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and flagged as link farms. The document body, though heavily obfuscated, appears to be a lure related to a scientific query, aiming to redirect users to malicious sites. The presence of multiple external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=what+is+the+formula+for+anaerobic+respiration+in+yeast PDF link annotation
    • http://rekijiwowak.scienceontheweb.net/61276133342.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/statistical_rethinking_julia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_601a3b7fb6b3c.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/data_warehouse_architecture_is_based_on_sql_server.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/97237279869.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvomafoda/ihxhgha/68341806210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fe06bd07fcc1.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/dell_latitude_e6540_i7_4th_generation_review.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/life_application_study_bible_nlt_leather.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/forgotten_realms_gods_5e.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/wosufatemedoperoruzonag.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/xikanozakitozesuvafo.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/IEShjjg/14788805453.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazobelo.onlinewebshop.net/gebebetavalubotovuluzepuf.pdfIn PDF document text
    • http://tufelorit.rf.gd/46557256317.pdfIn PDF document text
    • http://zewixezix.epizy.com/mandalorian_armour_templates.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_6a13891f025e4ef8b37ca9962f325fae.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_eb0711adcbc5489793d0a25f520a2044.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_256b5f8315c54140834fa46b5e3322e8.pdf?index=trueIn PDF document text
    • http://dijijesuwaxon.epizy.com/wafojefuvujoxalili.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 5508 bytes
SHA-256: a8460d3b318c4af7920bc9bffa1fa0219172c70e3c781270349e720a4a508fc4
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 11640 bytes
SHA-256: c17383eb08f64c1bc84cacf4d5d9c4b8b439e64e637adf0d8f51909b7068a3b4

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