Malicious PDF — malware analysis report

Static analysis result for SHA-256 e566ed389324a19a…

MALICIOUS

PDF

72.9 KB Created: 2021-02-22 04:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 231080f2de4c19fafab902ad9e33fe98 SHA-1: b7f0e41564b17adf4eb31168d0c49c6b4831d278 SHA-256: e566ed389324a19a6f88549cdb110f8cb7f7f5db233c360497f13d94e2434a7c
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized pages designed to redirect users. The primary lure appears to be a document about dialogue types, but the embedded links, such as 'https://maypoin.ru/strik?utm_term=ejemplos+de+tipos+de+dialogo+directo+e+indirecto' and 'http://alteramaks.world/xubotenepimazubozepovrzzgb.pdf', suggest a phishing or content-farming scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=ejemplos+de+tipos+de+dialogo+directo+e+indirecto PDF link annotation
    • http://alteramaks.world/xubotenepimazubozepovrzzgb.pdfIn PDF document text
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/1371821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_5ff906aa55277.pdfIn PDF document text
    • http://qunit.space/34304877891havhh.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/a8b8cf01a5a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fe9d4a44be26.pdfIn PDF document text
    • http://sarkife.site/88386321948ym71q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fef66e0bb73c.pdfIn PDF document text
    • http://wibimozuj.22web.org/3631526767.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/notigakilagolin.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/50516.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/tixeligufokup/bully_anniversary_edition_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/56727836857.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/jijulasof.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/64728419083.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/tevigiwigiritozel.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 5428 bytes
SHA-256: d334cc16df73624b546172ff4a0994f6cf5d80d0c3b7284f988d10e0a5e1d3b9
font_01_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 11556 bytes
SHA-256: d3713909ad9428fea191276adcb9742a1588199881135c58a4d252ed3436f252

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