Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb65d17f3317ff1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 00:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8031bf1f65d52d63fed75a5c6cd751a SHA-1: b4811f75bc0c445e8a67e5e2c874b02dedbab1f3 SHA-256: 5bb65d17f3317ff105525965d7b7e7b58b07d04d43ebeab517a4e185df06ddaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to unknown or suspicious domains, suggests an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://onsale.social-push.cc/data/fckeditor/files/sopumuranugarikuzegubotik.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/dubudonurej.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fugokosa.pdfIn PDF document text
    • http://tzsunup.com/upload/13184444277.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/54605071894.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/nakug.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/nikam.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/31375088900.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/safora.pdfIn PDF document text
    • https://lordoptika.hu/files/files/96982338964.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/lawekulijenapavel.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/besive.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/10238259887.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/turajalisa.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/basotekijepiwesedo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc805a8518---bijadowetexil.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/94365312391.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/dejotawazip.pdfIn PDF document text
    • http://hkacca.com/userfiles/40442560389.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/lewimibixe.pdfIn PDF document text
    • http://ashioke.com/images/library/File/rimufafudovibinozenobuji.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/8182493717.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/76036784843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=find+area+of+sector+with+radius+and+arc+lengthPDF 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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 17452 bytes
SHA-256: baa1bd18d3137edfea04264c66cd559eabb86d12434209c2b693f2e7032004f1
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10916 bytes
SHA-256: bbfd9e0c4f7830e20c16c01d37247902ba6c8fcccb5942ad0fd8b6b3a3767ba9

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