Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e224263a1fa0fe3…

MALICIOUS

PDF

75.2 KB Created: 2021-03-23 14:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69d1cedcf98194a75b85917f4a1c37b6 SHA-1: 23c4c893f5054fecefcf7410294a4e684faa4770 SHA-256: 9e224263a1fa0fe3a20f52af3d15356bfc4faba9009b1283a27a13bfb62065d9
166 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 0.9993

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/wix?keyword=college+algebra+study+guide+with+answers+pdf PDF link annotation
    • http://fojefojegut.medianewsonline.com/94621697594.pdfIn PDF document text
    • http://elinekici.online/zazanigujilewezilonemarijxqyzo.pdfIn PDF document text
    • http://cmbclientes.com/fugesojukutibi0crgf.pdfIn PDF document text
    • http://disconto50.info/saffire_pro_40_win_10r4cke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5fc9a69b8b0bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5fee7e8adb1c1.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/comment_attirer_l_argent_avec_le_basilic.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/maltrato_psicologico_pareja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_6010081a25909.pdfIn PDF document text
    • http://uptodate.site/what_are_container_and_empty_elements9mocj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fd7b2f1e9fdf.pdfIn PDF document text
    • http://kulinar2020.site/bikagomupibuwagiridas4jm1p.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/1cf5d246-e3e1-49c3-9f17-86c013293384/finekotigalevom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e9e423-5405-40df-8e4b-f393bf5a4565/gemini_alarm_system_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efaf282-1f81-440e-98be-746417b6ae3f/82511007202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7d887e-b95a-4ff4-bb8e-dccc52b93fef/65940147168.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/articles_of_association_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41934a8-1992-4363-9652-79dddce92742/dnd_5e_players_handbook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/terraform_resource_aws_s3_bucket_object.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/alcatel_one_touch_pixi_4_google_bypass.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/coliformes_fcaux_risques_pour_consommateur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d3998c-573d-472a-bb86-514ee878da47/89201763598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da176ab5-3f47-49c4-bf39-ce5a98faadc7/bujobonumozukepus.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5540 bytes
SHA-256: 83f09f62d78aa16b97f55a64011392f4188c5b09249b331181635a0410c9b0c5
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 11044 bytes
SHA-256: 3735a589e7161c2e0bef46095bce347d6dc98c174248393d017c1fa539848974