Malicious PDF — malware analysis report

Static analysis result for SHA-256 2824afa0a1b16883…

MALICIOUS

PDF

76.0 KB Created: 2021-03-06 23:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 528e6615969fb8a9265c21fa18732b85 SHA-1: b42d4725525685d65ce869b44748c81d61816316 SHA-256: 2824afa0a1b168839161c808a6f37b92bcd7e9ce756307dd6d123ec520beaa75
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF SEO LINK FARM' designed to distribute content. One of the embedded URLs, http://unonatur.space/tijetutedemetomafufukojawbtgyx.pdf, is flagged as a random URL link, suggesting it hosts a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jacksth.ru/strik?utm_term=is+1+month+gym+enough PDF link annotation
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/0abc4efcf3.pdfIn PDF document text
    • http://nyvelsets.online/viraxigagefavsr1.pdfIn PDF document text
    • http://vir-tus.com/53029814288wii7g.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/63e88b5225aa57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5fdc80f38774d.pdfIn PDF document text
    • http://idealica-italiaoficial.site/85398489647hnmip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_600b358bb08dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fe91cca7f664.pdfIn PDF document text
    • http://unonatur.space/tijetutedemetomafufukojawbtgyx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogunabones/3054439319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d389b30c-759a-4bab-85f9-a12b2737cd14/xidotetulejebinatajilase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18e5d90-e2a3-4850-9a05-2485fa8baf46/32686467566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f22e25-989a-4c5d-9088-b7bee1438e08/zokezajepidimanoxojoribir.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/79830388671.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/18943020853.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/gexag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e902e33a-12ee-4d78-9510-d5f3fcb07bd5/what_is_chemosynthesis_mean_in_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc85df18-6112-4eeb-a62d-a0b3d143874d/what_is_the_quorum_of_the_twelve_apostles.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/guvalibodiwizurapapemig.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 4852 bytes
SHA-256: 0bbbd8b30bfbdc96df9e27448816e56d04b264106aba9ca94a3f424a5be2f8d5
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 10232 bytes
SHA-256: 742cf4aa4b5b8bd46f99b1839abe35c2c64325a367022168cca6f2463dabfbc0

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