Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ea92fce96900ff…

MALICIOUS

PDF

73.8 KB Created: 2021-05-06 21:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0dd97c6a14be493ee9c81e0d44d1bb26 SHA-1: db3eb5433776fffb9989929d084539b117108c6c SHA-256: c5ea92fce96900ffb4620f0bd3ea31acf4b076c7abb94a3fc580ae5ba34e70cb
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 0.9999

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://lozipotod.ru/strik?utm_term=star+trek+enterprise+season+1+episode+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387718/normal_60660d242d8dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_6004fcdee82c2.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/b466530410.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/6384268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370062/normal_5fedb568bb37f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fee9ccf00410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_6040c1a6ee7c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_6010564c987ba.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/516cc2c.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/list_of_awards_and_honours_2020.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/femofemomitev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_28bcb4daa5b0490ca104d00025f8469e.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_55bbfd52237442e1a2051539f77f3463.pdf?index=trueIn PDF document text
    • http://kakavogulogij.onlinewebshop.net/clases_de_guitarra_acustica.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_04fcef256da546f7a6ce3701729afaf4.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_cdf9f4cf4d2347fb88118e78b726090b.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_41e46d4270314a819eb08ace8eb9884e.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_a68ae2ad2ca14220af41676a17057b72.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 5264 bytes
SHA-256: 23e613de06d04943cad9c0b625c0e0d4780bd55b0cfe4d69759813238c40ee37
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10084 bytes
SHA-256: 29cf9e2d0841ea58bae7f850f802fb97c7cf83e5f9a78e82a0ec8ccc3a800213

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