Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bc0150f00c375d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 01:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23e4f56ce86523088719473d8eedf4ec SHA-1: 0a4123f1dbd30b00568df0be9f1cc02db841af93 SHA-256: 27bc0150f00c375d4e9c0ef96cef777e2b2d3d68b58a3ecbc2dbf9c3ad28d16e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and contains embedded JavaScript. The embedded JavaScript and numerous external URIs suggest an attempt to redirect users to malicious websites, likely for phishing or to download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://coretry.ru/uplcv?utm_term=back+mechanic+free+pdf PDF link annotation
    • http://studiolauramoschini.it/userfiles/files/21365018641.pdfIn PDF document text
    • http://unseretochter.com/images/file/tofevifafepinoforol.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/kasogunisinekozarogago.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73425584859.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/80400692581.pdfIn PDF document text
    • http://methese.com/upload/files/pajaweleruvadaxipo.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/lidodotebunatup.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/zixijil.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/vavamajupexibelebuno.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/zesuvuxape.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/80426646835.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae11ab8859---gilofivanam.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nenimabaxabe.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/59708607996.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/mivekon.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/70334486311.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jezavuwiset.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/nofomap.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/70244942774.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sowixidalepafumil.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/mezazijokabagafubuk.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/41814068680.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zolobopus.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vlocqe207t38uc65v34g5js6m1/kusimegurudimafinot.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/70451608446.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_1CA358E1B34A0246.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 10596 bytes
SHA-256: c6ab06634ef1ac0703f874d96498a08de48ea28bf1f38d5077884218e67910f2
font_02_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 18312 bytes
SHA-256: f3b2e437fc983c9ce7566001bbc8560dbdeecc9409bedfdc4bc0639e80fb961f