Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e42825c0896320…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 11:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1060c2c62b550fd9f5882475f8f8145a SHA-1: 12c2778b2d5034b649f27cb9bab1a41dbf585348 SHA-256: b7e42825c08963205600cd46e28daabbe533d6b01fee9b23bf0a774cc67e4e08
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also exhibits characteristics of a link farm, with numerous external links pointing to other PDF files, suggesting a distribution or phishing campaign. The presence of a visual download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://daonshop.com/files/fckeditor/file/xofanenazezuni.pdf In PDF document text
    • http://hansungid.com/userfiles/file/4794565951.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/zefonaxudixajebogowir.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/82902050361.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/59069215623.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/pudopivigavixilowijib.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/xunawufo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/19899894015.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/18291450764.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/91610580116.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/xifonemeror.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/fuzajufuv.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/rapakoxumabawisotikofojit.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/gofinina.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/94072272849.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/2003854802.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/25397545597.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a2b31a4c1b54dc692e04a2a2d7847a0d/xonesibuge.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/4618398848.pdfIn PDF document text
    • http://i-physiology.ru/upload/nidogoloxamowejivewema.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d59bd1947---22614952384.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe31bce97---dojilikejamu.pdfIn PDF document text
    • https://cncunse.com/d/files/38225964084.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nevegowarorosanulavele.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/pixotakubesulenujetas.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210906103844_o7p8wr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=8bp+aim+hack+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_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 10212 bytes
SHA-256: 63836e7cd25ee9b53ad55868cca052cdbc246d97358fa169c01962c63358840e
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16664 bytes
SHA-256: 1ca99a29334b98f9198fa3269de098da01a04951b9e9f7076219bf0347af9d61
font_02_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1