Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ecab7b6ac7f81e…

MALICIOUS

PDF

83.2 KB Created: 2021-02-22 05:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d6d788d6e34e57c8b850a7768ed78323 SHA-1: f5124f9ae01286d8eca6e30c822533715c1a22a7 SHA-256: e5ecab7b6ac7f81ece3465c028242ea7a3b25b3a53d0036724db36a2c0ab47a0
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://druttle.ru/strik?utm_term=web+services+testing+tools+postman PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5ffce390b64a3.pdfIn PDF document text
    • http://montana-media.com/liviresuxubutafofufinukisljhh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fdaf48da2057.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/9034037.pdfIn PDF document text
    • http://hiziryigit.online/741694913334inie.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/1162493.pdfIn PDF document text
    • https://wumasokur.weebly.com/uploads/1/3/1/3/131384536/5104764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5ff78988027ae.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/512595.pdfIn PDF document text
    • https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/mogevunedowur.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/kurirosab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_600cecd6c91fc.pdfIn PDF document text
    • http://verification-help.business/the_kartilya_ng_katipunany0z3j.pdfIn PDF document text
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/widaxiwapurixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_6031ccb88021b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 5468 bytes
SHA-256: 21d7210e387b9cf1040b0f0f8a55ffee4122cd4979b30775b63f1297db5cb330
font_01_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 11416 bytes
SHA-256: d084e71be62546887eafaca9b592617092a552b13ff0252793317fc4a0ce94a6

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