Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebda6b714459e70…

MALICIOUS

PDF

74.9 KB Created: 2021-05-21 20:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3cbad15d145327afee9b47c4a00d09 SHA-1: b278e6c00384caa58ce434762ef8b8733df99e3a SHA-256: 5ebda6b714459e70ad969cab531d122813deef21a2728000791f731580524cda
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 pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://bologen.ru/strik?utm_term=periodic+table+igcse+pdf
    • https://xevekefipozi.weebly.com/uploads/1/3/1/4/131406281/35b133d9351b52.pdf
    • https://gipudakewisuvu.weebly.com/uploads/1/3/4/6/134665668/1ea34ddea.pdf
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5ffbae256bfdf.pdf
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/9041605.pdf
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/keveposidavelakog.pdf
    • https://supuniwugi.weebly.com/uploads/1/3/5/3/135317388/6635444.pdf
    • https://bekozowa.weebly.com/uploads/1/3/4/7/134713297/1540109.pdf
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/banizakeb-nimej-momopasowixoli.pdf
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/wanevibux.pdf
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/760b17401e4856.pdf
    • https://cdn-cms.f-static.net/uploads/4380527/normal_6056499306fb7.pdf
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/636419.pdf
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/8773094.pdf
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/zezoken.pdf
    • https://static.s123-cdn-static.com/uploads/4388818/normal_5ff80473f10f8.pdf
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/jetupukav.pdf
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/228dec239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midaguvimabof/miponotebemupami.pdf
    • https://uploads.strikinglycdn.com/files/13958943-12ea-4ca3-8797-6caa0fc17e56/lankavatara_sutra_quotes.pdf
    • https://uploads.strikinglycdn.com/files/bce4eeee-dc04-4cdd-9078-6e80589a5041/70013068348.pdf
    • https://uploads.strikinglycdn.com/files/8b1814e0-7587-4991-aef8-f0deb1c57c08/26759143077.pdf
    • https://s3.amazonaws.com/mejigavukolu/katejafikuderofepi.pdf
    • https://uploads.strikinglycdn.com/files/f37b8d3d-817a-4db6-bbdd-67a3d8ee61e3/focusrite_scarlett_2i2_driver_free_download_for_windows_10.pdf
    • https://s3.amazonaws.com/niporofez/evenflo_chase_plus_2-in-1_booster_car_seat_grenada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e656.bin
83e1d2e65793457aa42f35678dd58b96686854df4cda915c7abda2dcc979f86f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5464 bytes
font_01_sfnt_off0000f8f1.bin
b8db535211dd69e772c902cd73da8d358c9d63a414318f1b91e4052fdaaa0fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10464 bytes