Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0824ea934993df…

MALICIOUS

PDF

39.1 KB Created: 2020-11-08 19:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ad0cc14af591e736cdf17379df0e9b2e SHA-1: 1cf04bba9f74de711d877a9107fd8a8e9a7c6029 SHA-256: 6b0824ea934993df4dd112b9511f38d54f1669f6735d138cd7f01e6e0877ce31
84 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to an educational worksheet, which is a common tactic for phishing or malware distribution. It embeds a link that redirects to a suspicious URL, likely to download a secondary payload or lead to a phishing page. The ML classifier strongly indicates maliciousness, and the PDF_SEO_UTM_REDIRECTOR_LINK heuristic confirms the use of a redirector for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?keyword=volume+and+surface+area+of+sphere+worksheet PDF link annotation
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/30d1d49601fae34.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/luzexogo-xojiwagefewu-gonoz-gopip.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/2173841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rimofugu.files.wordpress.com/2020/11/71906757431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b5841f-5a83-41c0-890a-aee28b1fe3b6/nenulaneluku.pdfIn PDF document text
    • https://rabewinu.files.wordpress.com/2020/11/4822718359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c076e9f-f9c1-45bd-b2fb-bca3d4a80c22/uyan_gzlerim_gafletten_uyan_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/521e2913-84f7-4f3c-918f-3aa705178b49/zugumixexepenunimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffedaaa-3d89-4a39-9440-7a9d3e73b2d1/35899821269.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56A9 5516 bytes
SHA-256: b29e9ff7f52bfe50f84d988690470018fb11d51ca778e88197999f2c91f9b8bd
font_01_sfnt_off0000695a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 11352 bytes
SHA-256: ad0c2c40e72472d7b0fa237ccb1e1d4474b385221c9f615f5afa9b62019aa0f7

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