Malicious PDF — malware analysis report

Static analysis result for SHA-256 218faef0a181f00a…

MALICIOUS

PDF

80.8 KB Created: 2021-04-03 14:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b12fd75d3e7132d96e19f03ea67ed440 SHA-1: 9170c3dc25ac42ac86707917bd48d37e4674e7c5 SHA-256: 218faef0a181f00acaf22114eefb4da995d4aa02ea4d1939db9f0b09c283e2c2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with several pointing to disposable hosting and redirector services, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of link farms on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=how+to+explain+love+in+one+word PDF link annotation
    • http://cybety.xyz/waripamikidubiiae2h.pdfIn PDF document text
    • http://hyipinvest.site/lenodowujove8b035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5feef27506a17.pdfIn PDF document text
    • http://rumepado.mypressonline.com/rememigejewefuvezilusupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_6026abf0ee235.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/97209701483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_604138a7e472c.pdfIn PDF document text
    • http://copyrightsupporteds.com/8570012732735q1h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5fedd5c88cdc0.pdfIn PDF document text
    • http://natgood.space/paint_by_numbers_canvas_boardggo34.pdfIn PDF document text
    • http://dvertsoff.ru/how_to_reset_yamaha_receiver_tsr-700fd7o5.pdfIn PDF document text
    • http://teksalon.xyz/bioquimica_medica_baynes_4tazlf1a.pdfIn PDF document text
    • http://1green.space/96906575071cf59p.pdfIn PDF document text
    • http://graatorama.fun/thinkorswim_download_chromebookm9iyo.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/65954469706.pdfIn PDF document text
    • http://naturfresh.space/ejemplos_programacion_torno_cnc_fanu89sup.pdfIn PDF document text
    • http://qrastenmap.online/multivariate_analysis_logistic_regression_spss7yrdr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_f9381febb579481ba4df7f9437d864de.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_2cc54b4a198942ca901c8b0555972719.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_24d4c19d1c344d648baff6f02aed0d02.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_c5c75a879cd14f6aa9a9858598785cad.pdf?index=trueIn PDF document text
    • http://likutolejit.onlinewebshop.net/queen_bohemian_rhapsody_piano_solo.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/59224780093.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_3aa4f48342a844c891093468cd49e05a.pdf?index=trueIn 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_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 4956 bytes
SHA-256: 6c9f1caa76f1667f5f345fae1f84a4fa19cc035bc8a2a1334eda10bf23b36d35
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 13524 bytes
SHA-256: 1d07a70a67202b721c34797893f61a366cd7df14cc0e5bd24604a04e4c03aeba

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