Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bf7bdd3bf4bded…

MALICIOUS

PDF

72.3 KB Created: 2021-06-11 07:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 041b43078a6ea18fe27ed3f5f7a6267e SHA-1: c5a869d42246de4dd115637f6aad5ee9b04fc3d7 SHA-256: e8bf7bdd3bf4bded7417a38813ed52f607509f283c16ef49be18b6b693e9a0a0
186 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 external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://cructi.ru/pbw?utm_term=anna+todd+after+3+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448137/normal_603feb93d36d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_6012459ea212c.pdfIn PDF document text
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/gararuvafepav_visimo_kunafulekunom_jesit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5ffbe2119bbf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_60be3a70e731b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371247/normal_5fcb3fe8a9d93.pdfIn PDF document text
    • https://dolopexoje.weebly.com/uploads/1/3/1/8/131872138/fewaxosi_gavasodotivifa_vaxit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fd8959dac97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_603ddeaf4550b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5fdf649f80c68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5ff0c9ed9e73d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_6055e0674f723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekiravetad.pbworks.com/w/file/fetch/144619659/what_is_abeka_preschool_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561580dd-471b-49ca-8569-1df072a3a788/crossfit_wod_list_deutsch.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/145057086/technical_analysis_aur_candlestick_ki_pehchan_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af3e69f-658d-4764-b418-270be36b943e/muranejitulolimufegox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3569e89f-f4e4-4a52-92c5-3a9201675b8c/89601559989.pdfIn PDF document text
    • http://xanovobuxebo.pbworks.com/w/file/fetch/144887274/fowebuxuxobeninesidogepex.pdfIn PDF document text
    • http://lijunew.pbworks.com/w/file/fetch/145025823/48047769413.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/2005_ford_escape_hybrid_specs.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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 4980 bytes
SHA-256: 33d9d1e002162768c73d45f9fe04b5263ca4cf4e7f729b700c0da5e39b325251
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10668 bytes
SHA-256: daa6c08649d60fbaa1b7ba222f13ec369139b3c792bc49f713ffa7ad0ad6cae1

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