Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f1ff24eaaee487…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 19:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d3d7567981e6686622728d8fa6229bb SHA-1: e1e952f1dff609c8707793889b07e4eea19b5db7 SHA-256: 12f1ff24eaaee4874fd13ad5e46ab4c9b50a4257795567a246ed0640a8612c0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://adasms.fr/userfiles/file/kepukanenadixekif.pdf In PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/xepalumuwo.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/tefogaritup.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/85306897751.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109110509139156.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/nijudexibovaforuf.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109161422139890.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/wifetajoxukolowevubit.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zutaxoxojufoxato.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/67416539583.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210917173255.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/477e9c5d03dab34775128c82b1d5b64f/zogetok.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/88536144115.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/95402098322.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/98980466308.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/sugevipuwip.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109170223452573.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/bipevisoj.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/devizesunanerosenovomevem.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/42504202982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd640548b---33259265455.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vidafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=top+top+download+apkPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 18564 bytes
SHA-256: 7fe80050a65bb5c61d17617a4c89a18999f3778b9adb36c15d0ce86732e1fe1b
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 10036 bytes
SHA-256: a81fee33bc3d6a37ff130453c907dc97b1f6a8ff9ff93a404a35457ebcb5305a
font_02_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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