Malicious PDF — malware analysis report

Static analysis result for SHA-256 5923ac9c2053d2b4…

MALICIOUS

PDF

80.7 KB Created: 2021-02-23 23:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a831263f2d0398e146b821d594de0ee5 SHA-1: 34ebba2120c1f1f9d66d59feda9b7c36c4b47b89 SHA-256: 5923ac9c2053d2b408d2f5d5e57e6360946db70c2cf93aca2136e4020b342181
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://baarspo.ru/123?utm_term=narrative+essay+topics+for+middle+school PDF link annotation
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/8689090.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/5657122.pdfIn PDF document text
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/b0dee26abdc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_5ff7cc590af71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_601a63f2c6359.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/gemawonofi.pdfIn PDF document text
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/4717882.pdfIn PDF document text
    • https://fefolidagemilo.weebly.com/uploads/1/3/1/4/131453124/9421832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_601aca5fd5db9.pdfIn PDF document text
    • https://losirasi.weebly.com/uploads/1/3/0/7/130738883/6969548.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/763e391c866bff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_602faf6f5f54a.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/lesad.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
    • 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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5208 bytes
SHA-256: 30ed5dd9bd87c2a5f0ff5ebb318535d1886576d274dbb524f62de1ddfa5dd532
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 10112 bytes
SHA-256: 6bf176e52e7f1a296aece8426c43b5e9f9ba9421a59fd61893d82dc7a3152a18
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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