Malicious PDF — malware analysis report

Static analysis result for SHA-256 35172a381a05fbf7…

MALICIOUS

PDF

97.9 KB Created: 2021-04-04 04:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 347bc2db0160f9f3244786caccf88060 SHA-1: 83a9438554cfa80ec41091d4e5a86dba03d112f9 SHA-256: 35172a381a05fbf7a45876d5712c2afe0dd69402caa8d067715bd31fa5b2f8dc
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 0.9995

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://mezovuduw.ru/123?utm_term=vejiga+neurogenica+pdf+2018 PDF link annotation
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/revenolinewak_nivumumeseg.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/waxeg.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/jogelinunewi_rewixositi_pipuzutaxekunot_nijesod.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/11824699093.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/7161910.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/descargar_angeles_y_demonios.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/pakegi.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/zoguxokitorinuxu.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/administrao_estratgica_de_mercado_david_a_aaker.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://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_714b06ef371b49739ac0d3942575c810.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/papuja/java_programming_with_examples.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_f6cfd8993a9844048cc46fb88fcf41d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/kuzadime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f5c324-b4b3-4d30-a620-1f0ca49191cd/watagaberizejuxulonu.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_b0b7c22110c04d9da76e5995b64c0e0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/32574726779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281448cb-e917-4ab9-a721-1c29a2a5973c/vepeweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2c521b-9efb-4c0a-9523-e0782fcfb98a/what_is_the_difference_in_straight_ticket_voting_and_split_ticket_voting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5e5bf0-f42b-4b59-b8c2-a77b850d28bc/rifulasurixovosuzivikes.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/dosenozufilowudawos.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/fur_elise_piano_tab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 5476 bytes
SHA-256: 43dd53f6ca2ca169bcb67d727eac93a9ee7eff057296040a7ace0278eefcdcf5
font_01_sfnt_off0001439a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439A 11792 bytes
SHA-256: c667dc6971d290da585e2017eb91df899a8bcdbaced4127c1700bc3b87038ff0
font_02_sfnt_off00016a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A14 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34