Malicious PDF — malware analysis report

Static analysis result for SHA-256 66299e587ce5ecc6…

MALICIOUS

PDF

78.6 KB Created: 2021-04-27 18:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85c233dbe8a0b1699c198affb4fe33d2 SHA-1: 51b1bebcbfd26f5efedabf7f369092c5927e73ba SHA-256: 66299e587ce5ecc6002250331980d6eb6c2322437bc96d60d3f1ff5866256c1e
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://dugedepap.ru/strik?utm_term=o+que+%25C3%25A9+o+direito+do+trabalho PDF link annotation
    • https://gapuromediwav.weebly.com/uploads/1/3/0/8/130814643/141708.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/909bfe8ce01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_602feb31baacc.pdfIn PDF document text
    • https://newekozowoni.weebly.com/uploads/1/3/0/7/130738578/2078963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5fe0fd3918026.pdfIn PDF document text
    • https://suterigegopos.weebly.com/uploads/1/3/2/6/132695321/7436101.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/betir.pdfIn PDF document text
    • https://dofabogadu.weebly.com/uploads/1/3/0/7/130739956/4dbf6b17ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480876/normal_60616cb780d1b.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/3822260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_6028200e680c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_bdb43c21866e4471aeb9ab6678ec968d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/zobifexapurifawezukuzo.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_d43ebbf266c34b358abcce982b1ca22f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/86451213603.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_68dc74c050d64f858a56a07c48ba26d6.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 5172 bytes
SHA-256: ef6b5f7d6e6dbf0770da815a690c228cd619722c381d62f400156796acd143fe
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 12884 bytes
SHA-256: e562fb4cb8f486c6d16c1f9b403b1d3289ac8f97eb8d9256104ab308016484e3

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