Malicious PDF — malware analysis report

Static analysis result for SHA-256 269b2d5ba9787c23…

MALICIOUS

PDF

93.5 KB Created: 2021-06-05 02:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e2838fff6d852043e9f7b0c05f158be5 SHA-1: 6120ce184177778e009ae7228b0df56a6dd243e1 SHA-256: 269b2d5ba9787c2365b63c2ea5e55791d821554196e1b5e01da4975cd9b2eb38
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards a phishing or malicious redirection scheme, likely initiated via spearphishing attachment.

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://krisoc.ru/pbw?utm_term=mitosis+virtual+lab+key PDF link annotation
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/mojokuput-nomukilir-lanijukisekerus-vibupafolizono.pdfIn PDF document text
    • https://fifilukativoj.weebly.com/uploads/1/3/4/5/134509223/7f40ec5c.pdfIn PDF document text
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/mekuxofem-tofav-biwonojopebuk.pdfIn PDF document text
    • https://birafuwufejutik.weebly.com/uploads/1/3/4/5/134598964/5216291.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/nizerupigavudo.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/f38c204c837f7.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/2c500ad31dc.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/mujakavoxalune.pdfIn PDF document text
    • https://jotelozaji.weebly.com/uploads/1/3/4/4/134484012/883413.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/1c45890146.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/gevijawera-xukepip.pdfIn PDF document text
    • https://jipuziloki.weebly.com/uploads/1/3/2/6/132695969/8951104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_60603f5ec19cf.pdfIn PDF document text
    • https://sesubovokur.weebly.com/uploads/1/3/4/3/134311777/367796.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/xukisekabeziba_titad_gigemu_kobadani.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/zuzakisulix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6050f16d12943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_603bc7b132438.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/2416847.pdfIn PDF document text
    • https://samugunu.weebly.com/uploads/1/3/4/7/134701516/e3cca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://demopefo.pbworks.com/f/how_to_connect_spectrum_remote_to_tv_and_cable_box.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/rusodunazuzuwitalu.pdfIn PDF document text
    • http://nagaxop.pbworks.com/f/39302653854.pdfIn PDF document text
    • http://kivotin.pbworks.com/w/file/fetch/144550998/how_to_bypass_google_lock_on_samsung_a10e.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/goxasugibenubesutovelizi.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_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 5052 bytes
SHA-256: 888b38dcc9138785dfe0667687e91a2d340e4e64948c20add1cf7826757f09df
font_01_sfnt_off000144a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 10460 bytes
SHA-256: b56cecb8fb3674594b7e282db6926c0246ee792597c06c601bbe990871057f4e