Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56f7d47543fc6cb…

MALICIOUS

PDF

74.8 KB Created: 2021-02-25 17:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 844ef5f190b25908fc7954f07282cc8b SHA-1: 9b370455b647e4eef4d852f89d5e4a6f43a9e227 SHA-256: c56f7d47543fc6cb2b2128f22ee1306024e8af7280b2d20be66a5b4aa6a23fa3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://bologen.ru/strik?utm_term=summer+infant+monitor+2.0+troubleshooting PDF link annotation
    • http://ziviludemedo.iblogger.org/black_and_red_wallpaper_for_mobile.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/2256305.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/top_selling_cookbooks_2020_uk.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/ca0d48b6d6f.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/29387733365.pdfIn PDF document text
    • https://zemotugevazus.weebly.com/uploads/1/3/1/3/131379252/3b9253a9bc.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/27fba0b51d751a.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/amplificador_de_instrumentacion_ganancia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_602d9b3cd7f52.pdfIn PDF document text
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/2de919.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/hgSyYji/nefosubunelojubel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowudunomus.epizy.com/rijitijodo.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/how_much_should_i_charge_for_writing_a_500_word_article.pdfIn PDF document text
    • http://totajenu.epizy.com/bed_sheet_king_size_100_cotton.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/juwonirakufubagosuleva.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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 5732 bytes
SHA-256: c4d2993e06f9978430c72ca806b05601df5b693c33a49487f7cd4afbd671c35d
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10716 bytes
SHA-256: 3dd1fea7e17f5fdb298776c13fe6b5bd6350537369847ec9389a3c7612198845

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