Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da51a5eefd3aa94…

MALICIOUS

PDF

138.9 KB Created: 2021-03-22 05:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 84767a4b3562f43ab282af7a0e365d6c SHA-1: c3edb54715424fa5faa2a7440a580c0cf9f716f4 SHA-256: 1da51a5eefd3aa945a8d2861265fd672e4069a3de31df3b1fa13035160fa045d
186 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many pointing to disposable domains or potentially malicious hosts, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URLs suggest a link farm or phishing attempt, likely designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=books+like+the+witch+of+portobello PDF link annotation
    • http://toxipoxekej.medianewsonline.com/46476009910.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/d1ad8578da3b04.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/frjcig7/25848021825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_604e6681aaf0f.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/gijgJhi/pirate_radio_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/EialibA/crime_city_action_rpg_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/ibHiahh/nebililekepuwulovufut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fe99895842b7.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/adjective_order_practice.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/vagalejirusaz-ribin-malitujawuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_6050e2a69949d.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/menulajofijesadosel.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/dudujopixejikug/46264526085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fd26d9-6765-4a7b-b93c-00ecb456e834/pleasure_without_conscience_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2f8fd3-4cf7-4923-95b6-849177ab1029/zotukepuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31f27fe-b72e-49c5-8893-2842460b2077/self_determination_theory_three_basic_needs.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/2001_chevy_silverado_1500_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/anticancer_a_new_way_of_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26782f3-2127-464d-a5b0-369c3579e805/90263206342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce60eb2-4cc9-417a-8c33-fddf4932823b/zopexevozagosera.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_off0001e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E476 5240 bytes
SHA-256: e5234bb861130a6e236f00547eb6ebf9d64ed5efc4a150610f4a96a9cd6f7635
font_01_sfnt_off0001f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F65D 11480 bytes
SHA-256: 91b44674ffaabd55ab6c4ebcbfd34f6fafbcb036052dff5e575d70b05d1f81bd