Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fac1643b7a63326…

MALICIOUS

PDF

71.8 KB Created: 2020-12-19 11:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9ff38ce17bd0dad353ed9ba67a3fb6eb SHA-1: 8e6bf645025ec28f6e0eb695556baa65871e4405 SHA-256: 9fac1643b7a63326f43d2e192ca6aae15e962e5596266c0ee8e0a2c4b9f1e937
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. This indicates a phishing or scam attempt designed to lead users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=no+man%2527s+sky+glyphs In PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/8467985.pdfIn PDF document text
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/zojikew.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/wojigokigat_lilibora.pdfIn PDF document text
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/bikosagelez.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/dogejoveledonom-dededot-fufimigir.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/babb677.pdfIn PDF document text
    • https://vidulegu.weebly.com/uploads/1/3/4/8/134897898/dogopik.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/9771030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c01fe97-e79a-45f3-9932-4fdf1cd4aefa/5424447904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b10adea-77b8-44a9-8ae4-4671ae114f36/xegapogijakafijatob.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf50ff5147b1480429d48b/1606373631544/mododixapepinabodujolog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3555211a-c811-454d-bcd9-458dc29ee41c/31611677394.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc110e9ff13940aa2409adf/t/5fcf3ec168c18617d40dd1e2/1607417538971/felipo.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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 5308 bytes
SHA-256: 82f591522277a95e193f5a722238c2489feff067c98e6aec9a51cea701d99e42
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10744 bytes
SHA-256: 14ceb2223136d948d64be5317ade63173baef85ff9e144664c67910d258f2380

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