Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad1f22a36ee2b44…

MALICIOUS

PDF

78.4 KB Created: 2021-05-09 00:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 853c56f100cbeb0c11fbc6dbc4e34f63 SHA-1: e6a6b39ae8e57a22a48ec4bd3cffd589461f8dea SHA-256: 5ad1f22a36ee2b44e54148613503571f957f0f7a7c0e8d68a1298ad0eaf711b8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=how+to+clean+a+hot+tub+jet PDF link annotation
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/759686.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/pafikotana-pofujuzutar-kakisokan.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/mefox.pdfIn PDF document text
    • https://cdn.sqhk.co/tifozeborot/ibNghjj/tiny_planets_remember_sports_lyrics.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/nasezu.pdfIn PDF document text
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/1238392.pdfIn PDF document text
    • http://sebekeruxa.iblogger.org/relatrio_de_auditoria_ambiental.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/vadubuwoke.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/66ce985e0e70c.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/fggF4WX/33332211492.pdfIn PDF document text
    • http://ripuvajuze.iblogger.org/upkar_english_grammar_book_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudexejuvejutek.rf.gd/mozajerezafibuxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c33b245-8fa2-479e-b46f-57362be149f4/36465931011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259c8d8c-c9da-4a12-b3f8-97e82a485ec4/53251022513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d973ae4c-55bc-46d8-b36b-3bfceffa16d2/65266718170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440d12b7-3ae9-4418-bf44-5c9a41e1f632/yard_machines_21_lawn_mower_190cc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadeb863-ac25-42b2-8944-0d5c8eedba7f/linksys_ea2700_reset_default_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b2924d-285a-453e-9d50-5f3312dab7a2/what_do_the_warning_lights_mean_on_prep_machine.pdfIn PDF document text
    • http://magomodatibotu.epizy.com/buttercup_squash_planting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1836ab-c02c-47a7-b9d5-90ff985945a2/88150315665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7f50a4-1c34-423d-a7ee-5b5147995567/bijuz.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_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 4880 bytes
SHA-256: 4acd1cf907ff99cc2e375670c9dd23bf3f47ac84dc11330d4c49d4d7a8076f05
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 11148 bytes
SHA-256: a1a8b84eee95f560cd78624e4b58cfae9130c6eb972c9e3b10861e0f56fb7c63