Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0551d89011d0aed…

MALICIOUS

PDF

79.2 KB Created: 2021-04-15 22:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9b3e17c970a120488eb4b1cdb6f75624 SHA-1: efd0207c0c211a85728d985d8c14930ace9938d7 SHA-256: e0551d89011d0aed67a6669a0806c523c7400903d308098cab8885e3eac52e56
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs and the PDF structure suggest an attempt to disguise malicious content as legitimate search results or informational links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=petsafe+wireless+fence+installation PDF link annotation
    • http://nekretnine.site/vuzakarazesuzut8pa94.pdfIn PDF document text
    • http://tesocoin.online/run_on_sentences_worksheet_answers_englishforeveryone_orgqf7jb.pdfIn PDF document text
    • http://boothattendant.com/what_are_the_cottage_food_laws_in_oregon7uz5i.pdfIn PDF document text
    • http://onlineeshop24.xyz/xafevefebamel7qk60.pdfIn PDF document text
    • http://sale20.site/what_is_machine_learning_engineerf9b3k.pdfIn PDF document text
    • http://iminn.ru/2000_mercury_150_efi_fuel_filterodxvl.pdfIn PDF document text
    • http://garant-ritual.online/29218657749nalj.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/14169479895zor03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_e45952dd5dee496e87a9e3135623996b.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_605daab1181e4297a2803f10a0259a11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/nofajozilesibamebajatefen.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_976573e9c7f74ddbb50aa49bbf5029c0.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_03397873f618406681ab5430262091e4.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_e79545edddf34b848e2bb74e97d08fe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/69664627671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79d2463-2874-46e2-bb75-5384043143d9/gudujixudanifofidus.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/pabajilulawumosumapugivaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485d9376-8cd9-4d2d-b835-0d3196d40e12/netgear_wnr1000v3_bridge.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/data_structures_and_problem_solving_using_java_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d027c115-1d1b-4c0a-9386-5a847ae08517/online_iso_9001_internal_auditor_training.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/daraboxevamirogup.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_234a97c4de574060ab840d73a2c3e0f9.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_90a1be16a1124c40a04425123b4f6fde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/080d6866-6359-46c6-995a-c0729bcfc4e3/demav.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_81e07dee973640b1bae18f7d68608bd4.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_5112475566da4cd79df94339ad1407b3.pdf?index=trueIn 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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 4968 bytes
SHA-256: ac4831c77501113bc9674da6e61dd6372db99cf336ad8b9e8e696c20cb85ed21
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 11236 bytes
SHA-256: 27410ba03c7980177481e4825a80d81fa5af486370cf77ca7030a7ee0e7b4503