Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d413ce7d9d2c1a9…

MALICIOUS

PDF

81.4 KB Created: 2021-04-16 23:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1aa064657322c58f6fd881b37aa2329f SHA-1: c873b48fb27bdadbaac919540ad1c8b4206ecb38 SHA-256: 4d413ce7d9d2c1a9a64c86233e93c6be8f2545e6732bad91475370c8b07b162c
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=montblanc+meisterst%25C3%25BCck+le+petit+prince+aviator+legrand PDF link annotation
    • https://cdn.sqhk.co/xeliwiwogivo/fjf7Jhc/hockey_goalie_training_drills_off_ice.pdfIn PDF document text
    • http://axecheat1.xyz/larutiwutiforop8kbo.pdfIn PDF document text
    • http://vsspb.ru/how_to_fix_e2_error_in_washing_machinem8xfj.pdfIn PDF document text
    • http://bionatur.space/riwimaravujekjyfj.pdfIn PDF document text
    • http://silver35.ru/wofenixaveremizumixtfoy.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/1gdghwP/new_word_games_online_free_scrabble.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/kohler_jacuzzi_tub_cleaningk7ygb.pdfIn PDF document text
    • https://cdn.sqhk.co/kubibosujiko/EgjQBic/bavabemetugokirebinirinu.pdfIn PDF document text
    • http://gativatur.getenjoyment.net/farmacos_ansiolticos.pdfIn PDF document text
    • http://vsspb.ru/balanceamento_por_oxirreduo_exercicios_resolvidos4lvvq.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/eThdNUI/kapaluniso.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/online_blackjack_tournament_with_friendshf1sp.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/RtifLfh/45442870266.pdfIn PDF document text
    • http://petersikdar.com/craftsman_router_table_partsdoa6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedonefekipide.myartsonline.com/daposi.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_2db5145519b34464bc401176d25647ac.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_8e369fc22d5d41f58d34d75a04182a9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed4397c-0a40-40ea-a184-1b64ff46ab67/91782642564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be63aca5-0597-4ef4-840d-2648e3501c1a/le_voyageur_contemplant_une_mer_de_nuages_commentaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d1b555-c3df-418b-b724-aa614e500cd6/mutuwewugiferavireluvej.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_a55ddff7751a4a469e10d05107e337fc.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_8621b7bbe64f49d5b0d46a7265028c3f.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_52bb44a0ba0a419aa38514597a900be9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5568 bytes
SHA-256: e8c7164b58f1818d9050a20361f16758ab11cbadc4d710ef76276058c8abccff
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11652 bytes
SHA-256: d016f556a480440bb202ccc9c8230a93bc604a3ede5160c2f02d584e3c1e0b68
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3