Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4612738ea0c72a9…

MALICIOUS

PDF

71.5 KB Created: 2021-02-13 00:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57f18b0ef3de4418dfd2700ca40c86d6 SHA-1: c562f74bedcfe4d8066f7c9956aa3744304ac127 SHA-256: d4612738ea0c72a90334d6c119a55cf6898959cab826aba173518beb9a41ea75
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=volume+word+problems+worksheet+high+school PDF link annotation
    • http://jezapaditasas.22web.org/expressvpn_unlimited_secure_vpn_proxy_apk.pdfIn PDF document text
    • http://fisurigata.22web.org/36009286708.pdfIn PDF document text
    • http://musc-media.xyz/panasonic_cordless_phones_answering_machine_remote_access3dxn5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fe5deeb8a9f0.pdfIn PDF document text
    • http://gikiwasixe.66ghz.com/antalgic_gait_adalah.pdfIn PDF document text
    • http://moekolechko.icu/2682785756tfi2j.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/fusopoxipo/android_games_free_apk_candy_crush.pdfIn PDF document text
    • http://fapujeg.epizy.com/free_html_business_consulting_website_templates.pdfIn PDF document text
    • http://zofutigo.epizy.com/booklet_style_format.pdfIn PDF document text
    • http://fudogupadi.rf.gd/pizapamebopukafikubazi.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/anger_of_stick_4_mod_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/xovekufemarekabuz.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/xoxenivem.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 5540 bytes
SHA-256: 5dbeb3dbc8b0fedc3adf77aba8d4ac139b103adc5160af8c091ce0b5e00c8c16
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10608 bytes
SHA-256: ba02a73e9d4d76390c498e485c697ba7a2d75c8a460951116268be4841970eca

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