Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a18ab81ca698fae…

MALICIOUS

PDF

81.3 KB Created: 2021-03-25 03:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e96fc02a5d515c662ac9c2fb7e4cab30 SHA-1: 3910311ba24c79762a1a02d6cfdb159646acf3dd SHA-256: 8a18ab81ca698faece0b0e83ad4fc6a201f5c273e9c2d3e7bd82aeee580d41c4
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 0.9990

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://zajinet.ru/strik?utm_term=my+cousin+rachel+book+club+questions PDF link annotation
    • http://mazikopipovix.mywebcommunity.org/juxekaxefogolobu.pdfIn PDF document text
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/bubawilesajima.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/16420577423.pdfIn PDF document text
    • http://dopelozaf.22web.org/insinkerator_evolution_septic_assist_3_4_hp_waste_disposer.pdfIn PDF document text
    • http://sokesiket.22web.org/nizivozaxelovipiruj.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/91557987241.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/amar_chitra_katha_all_books.pdfIn PDF document text
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/39f44f.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/ffa14b.pdfIn PDF document text
    • https://weruvuwixaxo.weebly.com/uploads/1/3/5/9/135972833/nivesivike.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
    • https://s3.amazonaws.com/jovekus/sarejalukamesozoze.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_2e22dfc559db47ed87399963a113a9cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/medical_terminology_microbiology_definitions_list.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_01e7feff33334ce4b09786a117cb0220.pdf?index=trueIn PDF document text
    • http://zezibinevuzeliw.epizy.com/67988760018.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/hunger_games_books_paperback.pdfIn PDF document text
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_8bd85b8a60dd4d5a94f270955ec57f93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/dewalt_720_radial_arm_saw_manual.pdfIn PDF document text
    • http://xukuwagozoli.epizy.com/delta_monitor_shower_faucet_1400_series.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_4f183ef258994dae8154683df934fa32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/tixipiwurojukopujufod.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_e5a08f60b8ac48998a540d58b41def0d.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2c645f5bc6db4439a0e2e763e6bff250.pdf?index=trueIn PDF document text
    • http://jeruzofifisamen.rf.gd/what_time_does_brandy_melville_open.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_70ba020f5c1444bfb069bfd1158caf68.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_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 5204 bytes
SHA-256: ae7a167f6c565a6a8894ed11c9dc010d76dbdd7b370a279db605580238653e14
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 10888 bytes
SHA-256: 06f2bf3d17fe556922d1672e5da089505947b388c986869fd4c0de0ef3a0c266
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333