Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43517ae244f0735…

MALICIOUS

PDF

122.0 KB Created: 2020-12-15 10:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9ce9fb80e064010f99fa64acd108c227 SHA-1: 1b3ae2b4b8b7103b5c05ae42c83d387ecb05d8d5 SHA-256: c43517ae244f0735e02ab3e2733c9a6d72ab809100b1114d216fb98756cc3785
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=cada+primer+dia+de+la+semana In PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/wotiruzi.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/18b0c.pdfIn PDF document text
    • https://mepuzorow.weebly.com/uploads/1/3/4/5/134500467/1298570.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/minaxigevani/21315510033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341bf93c-36b5-45a8-bd65-141065694f76/83879117960.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/bovofixavosepevemite.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc526fd92c50b1a1e9314cf/t/5fca43bf55485c3109bda887/1607091136940/5668062513.pdfIn PDF document text
    • https://s3.amazonaws.com/madegusulepugif/ninja_cat_the_game_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/bleacher_report_epl_predictions_week_33.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_off0001a1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1AB 5012 bytes
SHA-256: d92a362529a6cf6731ee5db560a1e70e1651c56eaaef4c7f245839c54771b44e
font_01_sfnt_off0001b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B295 11780 bytes
SHA-256: 3fe4e5817aad8e678740c9d9a76e0215227b4eabd52289a5c5777fc8ca19cbc5

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