Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29ff10e0ee3e65a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 07:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8c228ec1e56ba5631b12f12ccae2d3e0 SHA-1: 2e99392ce94c93983a1379ea0988ef761257b754 SHA-256: a29ff10e0ee3e65a6801e5b580b5217d600a9889c4db79a87802b53c901332ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=how+do+i+turn+off+notification+sounds+on+android PDF link annotation
    • http://trumoi-khutrung.com/upload/files/lowipekorixakebase.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/davirujix.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/41448252247.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/46684314828.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/60146808419.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/17382102442.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/96434698298.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e29d701c---vejoduxakozimuvowa.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/dudijuwaxigizigaforom.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/pemejavuzalif.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/44984231222.pdfIn PDF document text
    • http://8njl.com/userfiles/files/82294960126.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091317085222.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdec260aff---71444154280.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/zexaxujojituxilob.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/80221685344.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/bonitofi.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/20294610361.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-06-29-42-92.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109101048216218.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kufekerobazarazujobas.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/mufilozumugimiginokatu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/negozaminivev.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/20091180430.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/16859147649.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 10468 bytes
SHA-256: 0ade5329c33fb0115fdd1b25e476dcf334ea549bb9488180aa204725a16df1b1
font_01_sfnt_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 15840 bytes
SHA-256: 2219d6c6d9344c72a8ffd9a6bef4415a8a3a1d321d618ce0f1913ca27b86a798

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