Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f6d1a0059b07bd…

MALICIOUS

PDF

88.1 KB Created: 2021-09-08 13:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6afbe286d12e5fbe0f3422cad82b766a SHA-1: 8399eac0eeb9b6cfdc50b1250d753fc132d6afa1 SHA-256: 15f6d1a0059b07bd0e16493bfe1bf9d5c8c8730e4140b46ffc845e52e8d631d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests an attempt to redirect users to malicious sites. The PDF structure itself is indicative of a link farm, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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.
  • 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 http://cerritos.songhakbbq.com/uploads/files/18527246381.pdf In PDF document text
    • https://negaratoto.com/contents/files/rexamatinonuf.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840912166c---lomegiso.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/31355688777.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/47824205454.pdfIn PDF document text
    • http://live-net.it/file/605691597.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/51867831368.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/79505839588.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/14060577107.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210905020037.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77706491123.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/suvamozodunolaj.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/wotejutavemiketuvipag.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/49940676367.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090114054973499.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109021433254168.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/85559963209.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8042ee1bc3c93a72d98aaea4fe1fc82b/beveza.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pejuligopedaxakisika.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/26966154069.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/17485043853.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/fogit.pdfIn PDF document text
    • http://leeandrewdavison.com/download/julonaderitobomanexo.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/59317302139.pdfIn PDF document text
    • http://medrea.ru/upload/files/12314009314.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/nezejewotorakegojebefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pesticides+list+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 17796 bytes
SHA-256: b11d07fc08d909e98680a9689c56d0121e4db50101c6804504d2b086101bd599
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 17072 bytes
SHA-256: e818989edf03f333fc4d9c0464985ffb40d7ce9a78d5f37ebf016cf1ecc13ac3
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B98 10128 bytes
SHA-256: d9031f9975c013ce8cb4f234f990695a6ee7cc1ed31971186065fe8fa1109716