Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670110bb902e83a…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 05:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 984e9d1cc4a97f8f0c5fd5e8509eb9ae SHA-1: 8764d774410e413e60b345762e4464f0bd68cbb4 SHA-256: 6670110bb902e83a7db5fa93868ca7d0965d1009d69213d7d559f85fcd9417ed
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=newborn+photography+posing+guide PDF link annotation
    • http://nufivuzelikonax.getenjoyment.net/islamic_bangla_boi_download.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/betoduzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_605c45be7400c.pdfIn PDF document text
    • https://zedumolubu.weebly.com/uploads/1/3/4/8/134862080/fososolesa_kokidimixa_sulabivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_6046f7450864d.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/how_to_use_procreate_app.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/zunokuziwipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d834e6c9-a822-4691-843e-9d978af56b39/health_economics_phd_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0c3b97-28af-47d9-a31d-5640d5d05f7b/esv_bible_study_plan.pdfIn PDF document text
    • http://noroved.myartsonline.com/where_is_the_word_assuage_used_in_to_kill_a_mockingbird.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fa4cda-4c3b-4d45-87a7-6229c9a9919f/belokuvifedexutudigiguw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6957696-32c5-40b0-91ad-d11677439753/best_wireless_gaming_keyboard_and_mouse_combo_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35743085-bdcd-4d6b-a46b-3709447a319d/viper_remote_start_7752v_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30072060-eb97-4362-bc23-5bdd86c9e585/husqvarna_yth22v42_mulch_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53e2219-c6eb-42d0-b3c2-50267fdc9722/mineral_oil_chemical_components.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14e30be-e621-406a-9aa2-35b9beed65b4/most_common_complication_of_acute_myocardial_infarction.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/ragegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ebf89b-aa81-4801-a5c1-bb4bd9adbb9c/fagitexujeka.pdfIn PDF document text
    • http://mawokale.myartsonline.com/xurefomenufeviwedejewifo.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/bruselas_mapa.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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5492 bytes
SHA-256: 5bcdb8d6f79674e30dd4178149764d6c04ec0d93ef9543db7ed8d00d0343e5a2
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 10608 bytes
SHA-256: 6356f16c28d41803e5c580fc4058352f15235dc136f499ce0966cb48622f86b5