Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2606b07ac074ed…

MALICIOUS

PDF

88.6 KB Created: 2021-09-08 22:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3c554a99af1e0db19d34d039fa89905 SHA-1: 90b8c2f5ddffea2bdb332960ea2001015f55ed6a SHA-256: fb2606b07ac074ed7711aca0108fbb2d21436688f928c843465a8dfdf6dcce1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable domains. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=www+lollipop+game PDF link annotation
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutipibizejutuleforawi.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/pidexewikejebalumetadiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee55a570ab---sajataze.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/liveneleruvafuvolu.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/megolujitejevamesusel.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/lajakikoz.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/6252020742.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/84363463503.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/mojirozujixaxovevogowula.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/witerunofajimubuguzup.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/91981452535.pdfIn PDF document text
    • https://limsurdua.com/contents/files/43967583037.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/89204167581.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/gifafarosesukuvajoparuji.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210901064222409.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/dotofozumukefazu.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tujiberadefif.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/sofenagi.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/tadivewilegutapiviku.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/mipop.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jelez.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/geregisoxonovijowu.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/15080148138.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/piwegaxozovo.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_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 17984 bytes
SHA-256: 257df04a49ab90f4fc926c31b76ba7926007db23305fa54053de80858bd7143f
font_02_sfnt_off00013de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE1 10204 bytes
SHA-256: 7a2e1f57ac6ca6a39f8f29652e29d7e7bfdd7d9d40e6220420fd4a18646b5754