Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07d6ca11a6fe417…

MALICIOUS

PDF

68.6 KB Created: 2021-05-29 12:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79634882382c6b02bb64d0c1809dd210 SHA-1: c5b181214737b292ff76813f58810b737e425134 SHA-256: e07d6ca11a6fe41798850c49b34af665a3b54711e11cfacbb6f4642718840c8c
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://zajinet.ru/strik?utm_term=libro+historia+del+arte+2+bachillerato+algaida+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371505/normal_60517f51905eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_601258bf47ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_606503bd10936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_60144e893d2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5fe90f88819fd.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/2287350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffa441dbdb8f.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/4491854.pdfIn PDF document text
    • https://nugaxuraru.weebly.com/uploads/1/3/5/3/135388114/2886116.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/8706460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_603f5e6d724f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_6063d38e881e7.pdfIn PDF document text
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/7394334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_6041bc56ecdac.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/5770304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491168/normal_5fccc307a0048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5ffdaffad875d.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/2d49cb80f24.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

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_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 5632 bytes
SHA-256: 839d609f22cb926d7448385f8d6b415e153b19168b4f8c3b8fe2a3fa58fb1774
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 11776 bytes
SHA-256: 6320ec170b32a46fc452fc1e529b99512b74274bb65ab03c367af8b4c852da03

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