Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5e414df3369f65…

MALICIOUS

PDF

83.7 KB Created: 2021-03-16 10:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 58dcb574fec0aaf2bc94f194f9c93ff8 SHA-1: 1434e6ccf30a13197571bda39170d68b9777ebe0 SHA-256: 8f5e414df3369f65535179589ac79549a6202a7eb76a6b3065bbea28fdf72a5e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded URLs pointing to suspicious domains, one of which is presented as a search result for educational content to deceive users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=eureka+math+grade+7+module+4+lesson+14+answer+key PDF link annotation
    • http://mapugukabazewu.scienceontheweb.net/pastor_chris_oyakhilome_books_on_faith.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/1CheYgh/kimebonudipeligozapef.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/73665944994.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/ijhbxZ5/39503036542.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/eDPx6w0/moto_xtreme_3_winter.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/fK2BjaA/temple_lost_oz_endless_run_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutesugobomo.epizy.com/8932130887.pdfIn PDF document text
    • http://lagamifex.epizy.com/40340877063.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_263315b4384d442895599fdc3fd6a039.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1911bd-2712-4502-a826-c4607f36335c/como_se_hace_un_manual_de_funciones_para_una_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed480aac-44aa-471f-8e9c-7f57977f5aa0/moncrief_furnace_parts.pdfIn PDF document text
    • http://badiwiv.epizy.com/73575723113.pdfIn PDF document text
    • https://874ffa1c-547c-40bc-81f8-616d05536b36.filesusr.com/ugd/5ecadc_974898bc42cf4dadb5958f935cf37f10.pdf?index=trueIn PDF document text
    • http://dibulazovila.rf.gd/40588341989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601434df-ca11-48dc-8268-3f9f765015a0/55819471748.pdfIn PDF document text
    • https://4e82d7f6-c6e0-4c4d-9e26-26a59bd7439a.filesusr.com/ugd/7dd30d_ddd565896b4f4f6989ad2fae0bc42422.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/product_recall_procedure_format.pdfIn PDF document text
    • http://popaxaxi.epizy.com/16064372734.pdfIn PDF document text
    • http://dadosekim.epizy.com/office_365_booklet_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ec1f96-99a4-426a-aff0-68070d2b0b2a/best_books_for_becoming_a_real_estate_agent.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_bf5834a7ca5d4540b232a371bdc5aa82.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_9c5d037ccbef4e53be5fe39095ab6da1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20551beb-f7fc-4e1a-b028-e5965d1ea3c6/77406863008.pdfIn PDF document text
    • http://mejesikuwuvaxax.rf.gd/wepirud.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_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5676 bytes
SHA-256: 1aaeb1c2d45c30f1d36fb9cf88eafafeb1c1c7463c52ee94f44744838034cb52
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 11904 bytes
SHA-256: 8ed291fb3968567dde06df1ac1bff68c60d1d5b4069f03d4b8c111b50c440744