Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a9f1b6f6fdc960…

MALICIOUS

PDF

75.0 KB Created: 2021-10-07 08:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 084ec5ca63c9958847efb4198fbfa240 SHA-1: 7dbb130580ffb4021e7949e5e99d5bf7bb0937f4 SHA-256: 89a9f1b6f6fdc960381ae03a0a39abe1e50a123de5c9398bc5c3b784105f7d3b
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stapper.de/sites/default/files/userfilesfile/bonadabenatinabivos.pdf
    • https://xn--interpeas-r6a.es/upload/files/4851726955.pdf
    • https://chataigne-cevennes.fr/imgs/files/danodivuninetofuzezof.pdf
    • https://suksesunited.com/contents/files/4481577449.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/62381963355.pdf
    • https://cvzona.lt/resources/img/files/jodil.pdf
    • http://gesundimjob.at/images/content/files/bubazabaz.pdf
    • http://filipdegreef.be/uploads/files/54384870507.pdf
    • https://banghenails.com/upload/file/wofiwime.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20211007_09011852A5344C22.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161304d5c458db---72131267879.pdf
    • http://taociren.com/upload/file/210909130913024399wl9okpbk2k5d.pdf
    • https://apelhijau.com/contents/files/53332000836.pdf
    • https://khabul.mn/mmpa/userfiles/files/bedomutudexepixab.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/vukutegaxip.pdf
    • http://dostrojar.sk/UserFiles/file/sibojawewomopago.pdf
    • http://kisito.com/userfiles/file/1272430949.pdf
    • http://unleadedcoffee.cz/soubory/puredatafefinaxafadopop.pdf
    • http://gomsuhoangminh.com/app/webroot/uploads/files/dakedugip.pdf
    • https://aksusu.com/upload/files/mevuniwigowisoxikirejem.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/70043471878.pdf
    • https://heritagecambodiatravel.com/userfiles/file/sunibabudoranonuzamajosem.pdf
    • http://emekyesiltepe.net/images_upload/files/garizukirogimefojove.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=daily+puzzle+7+little+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c339.bin
99d9dc2eb3fd55a9ad0366842161eedbe66e8060e29bfff0f026b78dfdb9fabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 16660 bytes
font_01_sfnt_off0000edcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 16792 bytes
font_02_sfnt_off000105e4.bin
1c537010aba9d68e22654e9f172b0a9ed3557b5aeb39ba4c8a375bb59a85a936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 10692 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.