Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ddaee57e1e257f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 476688d8e01853ea215d8369d54042b8 SHA-1: 2d4d5ef8201ef2cecac53fca3f4e75a46d3e4d22 SHA-256: 87ddaee57e1e257fe7c24c5035183628e3760d1a8b75e97820bd2fed640d9989
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the PDF_JS heuristic. The presence of many external links suggests an attempt to direct the user to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=mx+player+apk+for+laptop PDF link annotation
    • https://soudureornementalelauziere.com/upload/editor/file/gugeduzowapuge.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/tupejunezulawuloxitukiw.pdfIn PDF document text
    • https://intersat.lv/files/file/zazozewizidufulomegesapof.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/3256257795.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/wivej.pdfIn PDF document text
    • https://fivetc.net/uploads/files/15380389595.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • http://qwerty.pl/_data/file/mezosusatetadevobef.pdfIn PDF document text
    • http://iviltra.lt/images/files/xurapoketabo.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/mazatelomuvafilagabomob.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/felubaxejenagikobedaxobel.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/lujibivoxewagaduwowex.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xezenufavoperejegukin.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/60387962103.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zatogabofodu.pdfIn PDF document text
    • https://telorgabus.com/contents/files/xojanafaponabowajezever.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/laveda.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/fixetakivuremoduvaropara.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/sokuvusodezi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1f7d9f48---pesokakuvivo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/76455086242.pdfIn PDF document text
    • https://matrixx.lu/images/nurapij.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/83652915658.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xaxuliritinevogid.pdfIn PDF document text
    • http://rsst77.ru/upload/files/94880307988.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ketofulotebawifawagiz.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zorulir.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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10288 bytes
SHA-256: 260e4515fb972e447a413b35dcb179a6462bd54ec5a8da641b5e285e48808570
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 18488 bytes
SHA-256: 9ffcffccfd9dc737ba01b25f6c87165d3c4852e79d3a326bdfac2627daf5ecea