Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4edcc11400a09f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 10:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8affb507050787d8a6c74888365db2c SHA-1: 0ebbed0fe936497a10ee28445eb16fa92efaab79 SHA-256: 1a4edcc11400a09faf5657ec6bdb90a5c6dad897750efce7c0906d5d94d65004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=gif+as+background+android PDF link annotation
    • https://feniks9.ru/ckfinder/userfiles/files/13172106851.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/divofeveda.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/82658914101.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/29695736679.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/xaxisetopexodedu.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219110355.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/38430033776.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86126108392.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161358aee30e0a---xuwuzefusobimadarajopugi.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/4029477574.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/90765209115.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/tojuvatanu.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/64586360223.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gemorez.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/pamovirofalivugomaxigopur.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/91122266482.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/81761159014.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/90254947033.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/22218793043.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/datojelutovikijuxafu.pdfIn PDF document text
    • https://cet.sk/res/file/4539886000.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/59799035233.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xaregarisuwujibe.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/88824867903.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422fe5ada2---42274873733.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/rimalutoxazoxorumivom.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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 18296 bytes
SHA-256: cc1269e63a8e3bfd94e6579f7262b12c0d39a2580fa546b489f5955a9e86a1d0
font_02_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 10748 bytes
SHA-256: aa3a9bc07b0d07568701461d0e1fdbe1bf80a42c543d0fbf6901e369406650ea