Malicious PDF — malware analysis report

Static analysis result for SHA-256 87996cbf48bb953b…

MALICIOUS

PDF

60.8 KB Created: 2020-12-18 20:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 08a2ec17499e86d7380b13fb94e1937e SHA-1: 9a9808407ade40cf497a8ff5ded51cdfcbdeb25c SHA-256: 87996cbf48bb953b16d40f94c6ad7a94f7dc98690f537333977d9e3a77f1dfca
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 0.9994

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://traffking.ru/123?utm_term=kenmore+dryer+timer+control PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fc4216e9fb7c.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/bofapaniviwadona.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/ridemaduvip.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/wukagoxud_fovavobopibida.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/gisegunitofowuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f95da14cf57a.pdfIn PDF document text
    • https://miwomineferele.weebly.com/uploads/1/3/4/5/134514444/gizituj.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/3909541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jivagajamav/71766868455.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/pogimibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9253c8b0-1672-4e20-b161-ae89ca5b3661/recepcion_de_material.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C2 4556 bytes
SHA-256: 1284242f0808f1d8807533f93c1150d94311ffca2426390422420759d5ea1767
font_01_sfnt_off0000b82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82A 9512 bytes
SHA-256: 0e5a7136d6834422883789dec24dc8b537083a3ba95a38a0a150948dcd254a68
font_02_sfnt_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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