Malicious PDF — malware analysis report

Static analysis result for SHA-256 1798701dddd7793e…

MALICIOUS

PDF

78.2 KB Created: 2021-04-22 10:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ec762d63c7ed2ec89b23e9477a60eac5 SHA-1: ade43ad8be57d2ef4027a68614797aeab4b68f60 SHA-256: 1798701dddd7793e53cd22fa471c30cdbc0fe6d4363165a6ddd9de3ebdcd0b47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search results, directing the user to external malicious sites.

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/strik?utm_term=what+is+the+correct+order+of+the+divergent+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444622/normal_60144c14843fb.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/24223260665.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/kareena_kapoor_dietician_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_60224adcdb8dc.pdfIn PDF document text
    • http://datingdate.site/56294485846pkwsr.pdfIn PDF document text
    • http://doweryklkq.space/91818907044ehhv4.pdfIn PDF document text
    • http://uablog.website/how_much_coffee_do_i_use_in_a_keurig_reusable_filtervewbe.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/national_rice_cooker_manual_sr_mm10ns.pdfIn PDF document text
    • http://nout-prodat.site/44526490689tjx43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dadb05d-c8b8-4d17-b835-a80bfe2b0527/3046211008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ebe030-a0cd-4dea-94fb-829203d20088/procedimiento_para_administracion_de_medicamentos_via_oral.pdfIn PDF document text
    • http://sodefirujesot.rf.gd/pevefemopixogin.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/40341127586.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/kuwed.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/bepupebijudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f87d8ef-2bd6-4834-904b-2b5b6b4bb747/zipixajoronirenabesejaji.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/bikagesajatitateli.pdfIn PDF document text
    • http://bibarixe.epizy.com/national_lottery_syndicate_template.pdfIn PDF document text
    • http://dawiwafawuz.epizy.com/flexible_dieting_lifestyle_pizza_reddit.pdfIn PDF document text
    • http://wasofiwomorap.epizy.com/bangalore_master_plan_2020.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/wivajuve.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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 5324 bytes
SHA-256: e39e29ba801f77f4800e2a796da7f5ba7bef2f0b3e0030f81ddf81de49502b1a
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 10824 bytes
SHA-256: 17e428df21872d635d948d43ba026b8c07ff4d0b264b6f2b4d0e2e742d51da57

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