Malicious PDF — malware analysis report

Static analysis result for SHA-256 c536fe7487fcb421…

MALICIOUS

PDF

81.3 KB Created: 2021-04-18 01:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b46cf481d4eabb661c5469e9e6d8d469 SHA-1: 59b024e14ea90aec73366136a6c9980c9cd68686 SHA-256: c536fe7487fcb4216958f09f45d1dff2654b772024fd1bf86a3e1659051330b4
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 0.9996

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://leonvi.ru/strik?utm_term=training+a+neural+network+matlab+code PDF link annotation
    • http://waramejejit.22web.org/21846500499.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/cross_cultural_communication_barriers.pdfIn PDF document text
    • http://melivoxigozige.mypressonline.com/botupureliradupumokep.pdfIn PDF document text
    • https://kevifuzokidoku.weebly.com/uploads/1/3/5/3/135310888/0c4971cfb9d23.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/4476517.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/maxebira.pdfIn PDF document text
    • https://narukomoforu.weebly.com/uploads/1/3/4/3/134320250/pedifuwaziroze-muvitidevit-nemitozubob.pdfIn PDF document text
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/vakiberatuzisin_dugus_tazis_dabebapoki.pdfIn PDF document text
    • https://moxofeloxivaxig.weebly.com/uploads/1/3/4/4/134438573/davozamalotujezar.pdfIn PDF document text
    • https://kanogerigan.weebly.com/uploads/1/3/4/6/134657300/zotudaxam.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/zawufanofer.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/business_english_book_1.pdfIn PDF document text
    • https://mavegisokelu.weebly.com/uploads/1/3/4/1/134131346/4420428.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/gisasef.pdfIn PDF document text
    • http://dobomasinuraz.iblogger.org/router_table_insert_plate_template.pdfIn PDF document text
    • http://guwobedegaf.22web.org/2904862228.pdfIn PDF document text
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/3981388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikeratofi.epizy.com/career_assessment_test.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/75512141242.pdfIn PDF document text
    • http://zezunas.epizy.com/vimunokodo.pdfIn PDF document text
    • http://xuxowav.epizy.com/pejaw.pdfIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/modified_borg_dyspnea_scale.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_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 5328 bytes
SHA-256: 422355d7213d4121e95ef3510123a5d7f428734a2800b0539219072d6473a428
font_01_sfnt_off0001104a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104A 11544 bytes
SHA-256: 27df1d1ef3915c5cedb8339b169eb737f1574801f3e9fb216e161d0f613bc70e

Open this report in the interactive analyzer, or submit your own file for analysis.