Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ace1135d06d6e2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 08:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab75270d314193551efbdd33c65d722a SHA-1: 9d3d97a5b2128149d36daf6bb5203aeb0a9b272f SHA-256: 55ace1135d06d6e26f143f2ad09cfa5f2ab0e1841c2bed7466f19272d36d8313
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, many of which point to other PDF files, indicating a link farm or downloader. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://maiodi.com/userfiles/files/56881487694.pdf
    • http://peoplefineart.com/assets/202109/files/20210914122740961485.pdf
    • http://x-site.by/upload/editor/files/59980898049.pdf
    • https://sakkestadbil.no/userfiles/file/wesiromasafogila.pdf
    • http://archissimo.eu/userfiles/files/betojusobimore.pdf
    • http://vongtaygiay.net/media/ftp/file/bijodisufulo.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/74365895562.pdf
    • http://knshzj.com/CKEdit/upload/files/roxisa.pdf
    • http://csc0311.com/userfiles/file/20210909100352_n3aglu.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16142c276839b4---tanigu.pdf
    • https://kop-trans.pl/uploads/userfiles/files/xuvizebisizud.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ttmlpdphnqadf8mgvpbkr003m4/50645001136.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/jufararesu.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/24177576565.pdf
    • https://cengilli.com/icerik_images/file/dugapewe.pdf
    • https://wecareu.net/ckfinder/userfiles/files/jubenotivegidefisu.pdf
    • http://genarchi.com/data/temp/file/95959655974.pdf
    • http://humidorio.de/ckfinder/userfiles/files/19890162517.pdf
    • http://kemnhapkhau.com/upload/files/pubatadexilimagono.pdf
    • http://abwhopewell.com/uploads/files/sexegudagokodotarulagize.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/26583513793.pdf
    • http://cistenivytahu.cz/upload/file/suwozubururikite.pdf
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/50117956324.pdf
    • http://auroraenergyproject.it/userfiles/files/81549189557.pdf
    • https://ln80.cn/filespath/files/20210902125215.pdf
    • http://slkuang.com/v15/Upload/file/202191151487513.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=drive+pdf+viewer+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 16792 bytes
font_01_sfnt_off000103ef.bin
9b15125e103022f1fbb93222cece9cc5604dcde1512bcd9408f98e9e25f80693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10068 bytes
font_02_sfnt_off00011a7b.bin
b7af9190331ceb6fe0bca144b646267b941da136791d6160a28d225b252acac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 18140 bytes

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