Malicious PDF — malware analysis report

Static analysis result for SHA-256 89da7d78e31b4266…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 06:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3f8da61ac17df920f1aec0e4bd648a2 SHA-1: 28f5b235437cce1571f9ba77cc0b68ac7c844547 SHA-256: 89da7d78e31b4266e5ee89c26706e0451a72eab84ba2fed5180344fb57d73063
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a network of links pointing to other PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://savemaxint.com/files/file/xozajodeledukujilodemej.pdf In PDF document text
    • http://vhktn.at/images/content/files/71939836890.pdfIn PDF document text
    • https://eternalbliss.net/file/sejudabug.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/zununiniveme.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/koxuvemom.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/96648424649.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/13400572667.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/6612031077.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/83993695993.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/26971516378.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/57918061190.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/mopivoxiwozovad.pdfIn PDF document text
    • http://millecolori.it/images/file/99569244733.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/miditawususitolefeni.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/50426096133.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7aacc30b---razizutib.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/26882383629.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/pegalodanobipojomugu.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/kuzizapasu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/45624021640.pdfIn PDF document text
    • https://tch.lu/files/files/gavijebelemidobifafifud.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dunifimosa.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210905202257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+your+keyboard+on+your+phonePDF 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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 11008 bytes
SHA-256: 0eeb6bad7c5e534f27ab4c02c506969f3b9a9cbac36bb3f90613a0a809421250
font_02_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 17420 bytes
SHA-256: 28e0df2035d9f49e4981ab632c8ae6e774062f5dc621f4383a2e796b6cdc5ded

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