Malicious PDF — malware analysis report

Static analysis result for SHA-256 475d30ca4db83b30…

MALICIOUS

PDF

92.3 KB Created: 2021-06-02 16:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7d531209fed814b8d127fab949eb7df3 SHA-1: db2e13ba9852fc6863a73da6ef6acba875873c09 SHA-256: 475d30ca4db83b3006b7f46e390fdc69e74107552d5cef4f0f50840f791005d3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains a large number of external links, many of which are hosted on disposable domains or link farms. The primary URL, 'https://infrive.ru/pbw?utm_term=codex+craftworlds+8th+edition+pdf+download+vk', suggests a lure related to downloading a game rulebook, likely to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://infrive.ru/pbw?utm_term=codex+craftworlds+8th+edition+pdf+download+vk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fc7c391e7af8.pdfIn PDF document text
    • https://mogalarozo.weebly.com/uploads/1/3/5/9/135968713/9957226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_60193777719a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_60309d837c1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_603c7608eae88.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/1556958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_6058dc213f3f1.pdfIn PDF document text
    • https://mimoleratamofip.weebly.com/uploads/1/3/4/5/134500060/falobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fce0f13f26fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_601219fb6ca8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_605ac046216e2.pdfIn PDF document text
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/tezejotagu_bunar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_601cb1ac4038d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144446451/akll_matematik_defteri_5.snf.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/78411188959.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/96912244310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903472b5-03a6-4858-b290-64c0644d6036/77821944609.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144501111/analysis_pygmalion_george_bernard_shaw.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144501675/veledido.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/mecanica_vectorial_para_ingenieros_estatica_hibbeler.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144490272/12235214711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cafd24c-5166-495f-a019-f4e64c2e286b/siximi.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/microscopio_optico_funcion_de_cada_una_de_sus_partes.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/xemosete.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014bc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14BC9 16272 bytes
SHA-256: 1f3bc8252e44a813cf79f9c997f551a67effacb810d103eb970fcce6acc6a3d5
font_00_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 5624 bytes
SHA-256: 8fe70eb2c2b21c4f6cecac71f4bf37f814d61b5e59b7dc6ad1b0507374d4cb13
font_01_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 15520 bytes
SHA-256: a66c3b36d7ebf5cc8f92933042acadf76f0864d6ef9ad902f9ab50a66a0f5093

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