Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe977a3d0e882ca…

MALICIOUS

PDF

75.7 KB Created: 2021-03-01 22:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23fc363e76d1d393ef67e32616f8cf7e SHA-1: 8056d8a1f952b13290298af854991de36a861966 SHA-256: 7fe977a3d0e882cac82f8e6f0b91fe8cc367fd03b05e0b2b04113e57ada43533
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, indicating a likely phishing or credential harvesting attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=lord+capulet+description PDF link annotation
    • http://usacreditscore.info/sozirakukixebur0pb0j.pdfIn PDF document text
    • http://winwites.space/conductivity_and_sheet_resistanceiy45i.pdfIn PDF document text
    • http://ryursew.space/examen_ser_bachiller_2019_filtrado0aey6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6035760351fa1.pdfIn PDF document text
    • http://acupofjacob.com/graphing_linear_equations_worksheet_standard_formk0otr.pdfIn PDF document text
    • http://vedatolinofiz.iblogger.org/59241716113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6011b0f52926a.pdfIn PDF document text
    • http://ru-en.xyz/mokabunifesen2mkow.pdfIn PDF document text
    • https://nifatekotujuwi.weebly.com/uploads/1/3/5/3/135347118/zugewav.pdfIn PDF document text
    • http://zoom-omsk.ru/krups_rice_cooker_pricewxj20.pdfIn PDF document text
    • http://sarepoxorak.22web.org/ableton_live_7_for_windows_10.pdfIn PDF document text
    • http://bestplacefor.rest/cooking_king_boleteskio1o.pdfIn PDF document text
    • http://circulshtangcalip.website/the_hunger_games_part_3_in_hindi_download_filmyzilladd1mu.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/perafosorivom.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/2c0fd241b7ae38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedopurunidir.epizy.com/kidujenudulalo.pdfIn PDF document text
    • http://sefeluxezilire.epizy.com/55975650831.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 5008 bytes
SHA-256: 76d85a3c881eb7b30d0f4f33867ce6d5beaca6f6e397cd47aaaacfb93ddc8dce
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 1792 bytes
SHA-256: a2b551832c776e43e00b8e615a36ab5726813e37b79acb53ac974bec532c497e
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 10276 bytes
SHA-256: 97a8fc71b70a1173ec14b5294975e31d6043622e0699e5c76f013eaf30b5cb0c

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