Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dfe9e5deb5d1c1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 15:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad08f6a2080744c60b06622dbbecb163 SHA-1: c75b36047251394f4375c7203869e8813cf59efb SHA-256: 74dfe9e5deb5d1c1f6ef5b163718988f2f447d4131dc8380476747703d9943a0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one identified as an algorithmically-generated URL, suggesting an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file as a malicious attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://allytemp.ru/uplcv?utm_term=live+wallpaper+amoled PDF link annotation
    • http://bestofbeer.ru/ckfinder/userfiles/files/51625305667.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/55372363585.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/bapalukinukasuji.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/miluruwalupimewawa.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/vexorafatixepapebevifosop.pdfIn PDF document text
    • http://bdnchem.com/upload/files/73306021373.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210918_CE77A70C2EC8B945.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lakoxurosusa.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sinuwufodonenuvaxosax.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/mizepezesik.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/pidawewo.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/zirarubuzedamupibibiti.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/pejinatosefapipax.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138472057ad6---65379331150.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/2513275601.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133b07b5cd46---gatigulisurelutow.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/15485099347.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/21961321181.pdfIn PDF document text
    • http://zimmerei-possert.at/63826938070.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/juwepozexogoxav.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/pejuxosirob.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/60139106687.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/692451479.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sotod.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 10292 bytes
SHA-256: 655a2c0aaf73735b51a6c9d8a86642616a83e0034b42e93ecd8891791ee50eb9
font_01_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 17020 bytes
SHA-256: a18c4f945ae71308927144c72315c24fb4e492e18b3b80f5e7e1544745043cfb
font_03_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 18564 bytes
SHA-256: d19c2b846f343c19194589509588dfcb60c4696b22e86c3d98b4122c64fef47d

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