Malicious PDF — malware analysis report

Static analysis result for SHA-256 900ac4be877a99fd…

MALICIOUS

PDF

76.6 KB Created: 2021-05-12 19:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b54e135bb8618427d03a3b35a0901334 SHA-1: 9a39cbeafe3743f5528a8b49cde44a06bb41dcdc SHA-256: 900ac4be877a99fdc0cb1e79e44c7aca31dfc2a9860eb5de459e2b75807d8490
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the ClamAV detection indicate malicious intent, likely to redirect users to malicious sites for further exploitation or scams. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=why+is+my+spectrum+internet+box+flashing+red PDF link annotation
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/fojepagekavuzar.pdfIn PDF document text
    • https://razavojukuraw.weebly.com/uploads/1/3/6/0/136090857/4a666f1231e2.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/nonujujodedobele.pdfIn PDF document text
    • http://dimax.website/kerifob9lep.pdfIn PDF document text
    • http://takipleskazan.org/salexejud4640.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/xosolud_setafetasumu_foror_joforenapupogu.pdfIn PDF document text
    • https://xilamebi.weebly.com/uploads/1/3/4/5/134598653/3972424.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/butogulaxaguluzonidis.pdfIn PDF document text
    • https://fexupewoxi.weebly.com/uploads/1/3/4/6/134619994/0bc6ec117.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/kibijelowalakitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_603feb40e2e65.pdfIn PDF document text
    • http://discout.online/vawiwopiwebifododiddnw6.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/novoxop.pdfIn PDF document text
    • http://ihsteam.ru/hunger_games_tome_3avheg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fdc9dc648452.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/zarigitug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_602d2c656affd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_604a2f6c27d13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwafo/25_cognitive_biases_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/kaniduwi.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/los_adioses_juan_carlos_onetti.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/crochet_angel_prayer_cloth.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/verbos_irregulares_en_pasado_perfecto_en_ingles_y_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/povibazavegin.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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5892 bytes
SHA-256: 5105adf97b089079c9a711d711c0d4c0765b13f8ee082fda5516cea342857266
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 11808 bytes
SHA-256: 94e1f7fe02bc199c8c6f91e3bde5458f2ceb1ad4f26b76b388bf6a58b88379e0