Malicious PDF — malware analysis report

Static analysis result for SHA-256 c965c4709957efde…

MALICIOUS

PDF

92.9 KB Created: 2021-10-17 08:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc04cb2a443769bfbec0ae6d3ae3c56e SHA-1: c88bd02377ed024a02fe4a6b33b08b65af11b1b6 SHA-256: c965c4709957efde3894627bbf2d2151f1a1fda7a8c7b69075f24823c1a6006f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and appear to be part of a link farm. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

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 https://irlanc.ru/uplcv?utm_term=class+12+physics+notes+aman+dhattarwal PDF link annotation
    • http://kfnmsz.com/upfolder/e/files/20211009211633.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/91934116768.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/lesum.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/wifaxele.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/358527a71f81d62609d1ee89652bb132/82535407848.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/94087138253.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/digedabaxasavusiji.pdfIn PDF document text
    • http://lonsdale.ee/tipikas/uploads/sisupildid/10011861411.pdfIn PDF document text
    • http://tano-cable.com/d/files/zoguwo.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/varumojifepole.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/jizusuwobepibomifagafe.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/durulib.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/nowasiv.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/92731463179.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/jijemo.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/96837945082.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tekokozidesizuk.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/3445275647.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20211013_0784FAC24DEB5D02.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/kovibosuforagurivif.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/vapap.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565f6527754---kolorisebedifasiroza.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/85190742362.pdfIn 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_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11180 bytes
SHA-256: e8deae0bb614a8bb4160b43e2703246f36d482622d71dab801b7152575c5eb4b
font_01_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 22564 bytes
SHA-256: 53c26f45170d5d64ecfdcedae32a51497df4ad093b4b9f3237801f817814694d
font_02_sfnt_off00015570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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