Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4a7488863a8c1c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 07:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0ac764603bc4619338c97c540a9d379 SHA-1: 86f2d5065c44ccac6d657e8e0f95fbb3e788194a SHA-256: 3e4a7488863a8c1c2e7e4630b9c05388179382fda0bd886e3788e1e450386cd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is used to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://delta-relay.be/userfiles/file/fewunusuwaforogowi.pdf In PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/fozuji.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pinevimalolefupeguzuv.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/fepubebixegujuwekomofura.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/50986852270.pdfIn PDF document text
    • https://cian.hr/userfiles/file/mudipezu.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/pifopefilemiz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/diniresezipofiwo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16139b39f5a8b4---wizazoxiborup.pdfIn PDF document text
    • https://bliznacite.com/files/wetagawiwafibakulixe.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/gazuvumaduvul.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/numaxawex.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/wasugewuwopaxe.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/koguwujegodupolagedev.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202193949338154.pdfIn PDF document text
    • http://hla.vn/upload/files/xodagimimujefijus.pdfIn PDF document text
    • https://limsurempat.com/contents/files/pozovuduferunilo.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/36747153762.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/xamasoro.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/83155250659.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/kidupokanuramifikafa.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/93892175437.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/diwaxajimosifixofovon.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73957278700.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/robupujuzigesapepijimukez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gangstar+vegas+apk+moneyPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17F 16468 bytes
SHA-256: e060066348e36959cc97cbb6eebc2aa3cf99117694a569176839004c62e4ddf5
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10768 bytes
SHA-256: b055c2a1ac28dd988bb4df7648be09df3e5065d6315ff30cc993fdf798e3f5ab

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