Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c31ff484ba2375…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 23:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 73dd5f93690a6ca9a201c90a201f5b94 SHA-1: 9a398c14d5e5706346f9d8692140f526ed04815f SHA-256: 63c31ff484ba2375cb6f93510483992829a455e74f48f9f20e5225c94cb1d2e3
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://resalured.ru/award?keyword=attach+pdf+to+excel+online PDF link annotation
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/votaxuvovif-keduxabokasanig-sidemalo.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/ig4gghd/8537911210.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/f1c1bb.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/bujusojedofonuzukilet.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/6955072.pdfIn PDF document text
    • https://bofanowowedo.weebly.com/uploads/1/3/4/5/134506880/varovini.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/gi5Ihov/44040412945.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/iikqKig/army_lover_full_hd_wallpaper.pdfIn PDF document text
    • http://repair-monokoles.ru/vipikep876u.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/how_to_sponsor_aa_step_1.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/53398850744.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/bigafamukap-puzitadumexewu-zidiruvu-jizuni.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/cf86d033.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/2ba0257cf442b.pdfIn PDF document text
    • http://tortomsk.ru/kituwukeriroxotive0wgld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitasixan.atwebpages.com/guvutepuwupolosumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125d44d3-8e55-4e49-b994-ecf8d5611a92/48610361359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e196b9-c9f6-454c-846a-4c225db72c2f/mesikalokovat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d205e9f1-a98b-4dbf-afbf-6362b787fdc9/26064043345.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 5028 bytes
SHA-256: 716aea714e73af44631253be0eca51da29ee75bbd0a9f05b101c23a82b7f3cb8
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 10296 bytes
SHA-256: 1fdd3f4f8ca5ce67c2e23eb0c8f014734880b25de8e9acc873e23ebdd11aa79e

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