Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcb46a2e574e326…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 05:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a57190fa534f53d0d2cdfec42edf4f66 SHA-1: ed589018f149e3a7747e1272166e575cbbaa74f3 SHA-256: ddcb46a2e574e3269fb261d9017ae88c6cf3118f95939d0db73ea93d2dc23b82
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a keyword related to Emily Dickinson, likely as a lure. The presence of multiple external URIs and a high ML classifier score indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=emily+dickinson+theme+of+death+and+immortality PDF link annotation
    • https://zexorekimapuwip.weebly.com/uploads/1/3/4/7/134702453/lokut.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/jejaxewanobol.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/zowadijopifademelewujulus.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/futexixeledurapuk.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/Nha0LyB/21396164269.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/2f90121.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/instrumentos_para_la_recoleccion_de_datos_concepto.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/73194406134.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/nosabolov.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/5G5hjTI/41187347685.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/brother_mfc_7420_clean_drum_unit.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/f34e2e6b-218e-45d0-8c64-590abb0bc8ba/tevawakagero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb50828d-8413-4467-a9d9-027d29735e76/is_silica_gel_soluble_in_water_and_methanol.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_c0e082b3576a40d6ab6ab67e860e524f.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_53cb771b6c0242b3abaa9b86069ccfc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a643a603-e361-4580-bd15-d9c4fb0dac6b/fedex_drop_off_point_near_me.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_0c6edb50053e4733af1c5a299c686ef6.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_73bee2706f7f46038c042302bd59dea7.pdf?index=trueIn PDF document text
    • http://fanalejowegop.atwebpages.com/fejaguvevizukoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4c6fe7-9265-40a3-bf25-7a24add9a580/momevelulewumusimevusoruj.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_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 5384 bytes
SHA-256: 71d0e1f860b2a4c848cf2a2ece3da0d059ce8b610aeee8e2533200b0d55502de
font_01_sfnt_off000110d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10836 bytes
SHA-256: 6a3d63de6524cae48a773d2a1430e3bfa213f75e8f4b1a5b0df08990316ae76f