Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbb1fa1ef2d9c5f…

MALICIOUS

PDF

81.4 KB Created: 2021-02-24 17:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17e429d3a4bb0ed93b8cbcc32f374f40 SHA-1: b6a38a1106fa5ba841bd41d53e81e6832abaab4d SHA-256: 5fbb1fa1ef2d9c5f61055e80f240333e8f3c1989bd9f1640e8038da9f3957c4f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various domains. The ClamAV detection and ML classifier strongly indicate maliciousness, with the heuristic 'PDF_SEO_LINK_FARM' specifically highlighting the suspicious nature of the embedded URLs. The primary attack pattern involves directing users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=inversion+table+fold+up PDF link annotation
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/5427024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470380/normal_60058327edd55.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/01320780ec83725.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/hcZjcge/83198422114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fceff74b51e7.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/contribution_of_peter_f_drucker_in_management.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5fe15399d95e4.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/hunter_x_core_will_not_reset.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/sipezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5ff29a077cb36.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jiuZtji/xitazafuziga.pdfIn PDF document text
    • https://gadogirunen.weebly.com/uploads/1/3/5/3/135347667/8266733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/baposivarabuj/63665905010.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/56389434435.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 5056 bytes
SHA-256: 5dc8b62197d01aa89844b13f024044ceca31aff4deba1d83e57588523471c3ba
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 11404 bytes
SHA-256: 163ebde463c90e500b703a0cd1ec58cf76991a8b93159f82afdfdb504ccf6a58
font_02_sfnt_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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