Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d74bbf2790074c6…

MALICIOUS

PDF

66.9 KB Created: 2021-04-08 06:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 40df7f1ad35fb36a893ff9f734833f38 SHA-1: c8e2d835a5ebe861cfeec6393cff17ea3b8be644 SHA-256: 4d74bbf2790074c68cc7a767c7a56537ac3f6978fc810f502e3f04c6f90aeab4
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 PDF files hosted on various domains, suggesting a link farm or SEO spam tactic. One prominent URL, 'https://druttle.ru/strik?utm_term=hebrew+greek+interlinear+bible+download', acts as a redirector, likely leading to a malicious payload disguised as a 'free download'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=hebrew+greek+interlinear+bible+download PDF link annotation
    • http://bumasujofoj.getenjoyment.net/55511344586.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/19241190711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5feef1ece52f0.pdfIn PDF document text
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/3927558.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/77ce4c220dd79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fff78d946343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5fcacdc078681.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/rozoniwipitopafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_600bcbf3efc18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_ee1aaa20d7c54fca9361a0fc6d76a137.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/clip_facebook_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/mammut_eisfeld_guide_so_jacket_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/95188376010.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_d1d3ee7478ee460f8647d53ae5a53e8a.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_fdf5cf6759cb4f59b4a6b1671f7af189.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/what_works_on_wall_street.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/french_to_english_dictionary_buy_online_google.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/zetasulomituxe.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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 5072 bytes
SHA-256: fe13d60c1fb60c5d1ca72cd237d1ecc7d89116d50c51f28b06b3f3bc7b093c6c
font_01_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 10584 bytes
SHA-256: 0728e2c8ba1da849232ab72f2b08f3aaae3d42e3a7399cee2176f53da2d28875

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