Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fbd6f93571ae88…

MALICIOUS

PDF

75.9 KB Created: 2021-02-19 20:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9eec7d0ccc9b0e26b77435cf636ff4fc SHA-1: 9aa818908fb84e62c4eed153234acee0c0567af9 SHA-256: 51fbd6f93571ae88a6970c497174d95f8ed0dfeeaa6e61891635dfd2ae16cf3a
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://jacksth.ru/strik?utm_term=ps+vita+2000+new PDF link annotation
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/wuduzativewenel.pdfIn PDF document text
    • http://yachts-4-sale.com/50_inch_tv_with_120hz_refresh_rate61q2g.pdfIn PDF document text
    • http://desoneveru.iblogger.org/kowaxixumaxipo.pdfIn PDF document text
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/2c042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_602f295c8ad14.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/kigebusa-notuvituna-nosim-dijeviso.pdfIn PDF document text
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/f18aaeb98b95.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/3926744.pdfIn PDF document text
    • http://webmastervlad.ru/hoja_de_4_columnas_contabilidad_form55rqz.pdfIn PDF document text
    • http://nunixofu.22web.org/evaluating_expressions_worksheet_word_problems.pdfIn PDF document text
    • http://getfreecreditreport.info/8105156771h5w8r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fea1d603aa2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_601cfa55bb684.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/19487772521fqnup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/93876529304.pdfIn PDF document text
    • http://wokobudedisete.rf.gd/tidufobonag.pdfIn PDF document text
    • http://lofadekiwi.rf.gd/jokavotikuvurabatoxavuka.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/bonfiglioli_geared_motor_catalogue.pdfIn PDF document text
    • http://katewamopexo.rf.gd/wedding_flyer_design_template.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 4980 bytes
SHA-256: 35f3bdc8f2d7a51e756fdb3afca458ec51b6d32c10c501f6483636cccc8a4887
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 12692 bytes
SHA-256: 5e3c4c2e21ebae87de8b1c2ff40be1db99512b925e32a64be69099121ba7692f

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