Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3b380414ee7775…

MALICIOUS

PDF

90.2 KB Created: 2021-03-23 12:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ca742621851314087042b2b798fc802 SHA-1: 18b4f90057371f52c755e21702172323e1a01a0f SHA-256: ab3b380414ee777505284b613e53a7a428fcdccee875551d62e68e7a51af1243
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm indicate an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=diagnostico+de+cirrosis+hepatica+alcoholica+pdf
    • http://jsexj.fun/94971069390me8op.pdf
    • http://cosmosqrab.online/brave_frontier_mod_apk_terbarua9bfn.pdf
    • http://ogranicbio.space/coleman_presidential_3_furnace_filtern54n9.pdf
    • http://samewejasaka.iblogger.org/79995550138.pdf
    • http://begokawepene.22web.org/familial_cerebral_cavernous_malformation_ghr.pdf
    • http://kinoxca.xyz/narojusasuwnbcb.pdf
    • http://gratoraama.space/kepoviserereh1v9q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/takateg/wubanirabizaz.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_af818ad858dc4fcca4701060142fdf26.pdf?index=true
    • https://s3.amazonaws.com/pozokimepe/social_media_strategic_plan_template.pdf
    • https://s3.amazonaws.com/pusixa/fitted_bed_sheets_egyptian_cotton.pdf
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_74f8a0f4c24242a8a70ed105016bec24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/20855616-f3cf-4436-a46a-a5f959cd673e/abnormal_psychology_in_a_changing_world_9th_edition.pdf
    • https://uploads.strikinglycdn.com/files/e448f95b-f1f1-4bdc-b95b-f4934dcc70f0/16712261947.pdf
    • https://s3.amazonaws.com/nakuzafol/is_the_stock_market_open_new_years_eve_day.pdf
    • https://uploads.strikinglycdn.com/files/2399cb49-c00d-477d-88b6-1a74cd7e841a/ejemplo_de_manual_de_procedimientos_de_una_empresa_de_servicios.pdf
    • https://uploads.strikinglycdn.com/files/612a9eda-759d-42e7-8300-dc97723f13ba/how_to_make_a_circle_diagram.pdf
    • https://s3.amazonaws.com/pozokimepe/kapajoko.pdf
    • http://vibibidazez.epizy.com/zurutakoralog.pdf
    • https://s3.amazonaws.com/wefemabeni/nupesubukawa.pdf
    • https://s3.amazonaws.com/dotivaf/zelienople_police_reports.pdf
    • https://s3.amazonaws.com/vukusa/call_recorder_app_for_android_9.pdf
    • https://uploads.strikinglycdn.com/files/ca682507-97e7-47ba-aad6-17a22b5ac3ad/apollo_twin_quad_mkii.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121c0.bin
84f541575a8b03976fbc09eaa710c245ecb8391ec1495b10fcc3b3c35d7a0c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 5416 bytes
font_01_sfnt_off00013430.bin
908bb1a812f35669c1509d87f5d59005740c0f192d88421c6f6c0dfdee6a486b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 12036 bytes

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