Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ededb18d1a0efa9…

MALICIOUS

PDF

81.0 KB Created: 2021-02-24 02:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1fa057dc1765af664490727a974e48f SHA-1: 987046c8458efb2dec614d9dee15782b0d01480f SHA-256: 6ededb18d1a0efa946d4916ce290ab24e21484ac0354fb7314b16de7cd9881f6
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=saxon+math+4th+grade+homeschool PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fcbbcb472109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_6031564f168e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_6006e37ab1e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fe9671c9d232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_6010fcb8e29dd.pdfIn PDF document text
    • http://cesaregaspari.com/kabimexagikb09t.pdfIn PDF document text
    • http://peskomment.ru/23504763429es7b0.pdfIn PDF document text
    • http://svarka-aurora.online/dalelogokear8e.pdfIn PDF document text
    • http://wezutoxizuwal.22web.org/b._ed_2019_form_correction_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_60209d93ed293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_60220f7080ad2.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/ff4fb3e8.pdfIn PDF document text
    • http://ujjjrrrrr.space/mavejekeperadasesovoi8uc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratogowadefezes.rf.gd/p602ui-b3_wont_turn_on.pdfIn PDF document text
    • http://kevarivujez.rf.gd/93905111193.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/barber_of_siberia.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/template_hierarchy_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/wilabupiv.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_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 5612 bytes
SHA-256: 02cfbbf617581be42acb1207686d0b2b8d6d7a1fff9e02d8d8871565f6085519
font_01_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 10852 bytes
SHA-256: aa950d311e159668d4d77a4c575bb2b1a52a1cb12dea3f83f296e9a90db91b67

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