Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeacb86f59c59c1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-17 08:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0995a914c4cac779fb45ee9f2e7ff1b SHA-1: 063bb6a2a35c74f3bed0142e6812beb94d12ac11 SHA-256: deeacb86f59c59c1d8e6bf2843bb143f8414622863bea9b3724767b197b52885
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, containing embedded JavaScript. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code, likely to download or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://panoramamall.bg/ckeditor/ckfinder/userfiles/files/30018673617.pdf In PDF document text
    • http://kes.org/upload/editor/files/44364420291.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/vejimom.pdfIn PDF document text
    • https://posh.hr/files/39550830603.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/volofopoxuzewodubura.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/xotezabareduwonajoraf.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/29767041613.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/xixolakapot.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/66800074580.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3596356e---11802333916.pdfIn PDF document text
    • http://temple.mo/userfiles/file/vodoxorizekalipamejurawig.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/3175762707.pdfIn PDF document text
    • http://esistore.be/userfiles/file/xikarixupogojimulewaf.pdfIn PDF document text
    • http://superbarter.sk/media/file/samusevifiradu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/72453224253.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109130454093420.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/61110256598.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/83711673019.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142234027461---50419975291.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/72775952351.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/57069194920.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/puwerujelejora.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/58088919383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=call+of+duty+mobile+apk+freePDF 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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 22272 bytes
SHA-256: 9bd66ae5e23f1be9988eb040e00881e7dcadf675376215b159781ba45e48b192
font_01_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10864 bytes
SHA-256: fc43f12d7f05aaa78e631e381fb1ff83213dec7b2be1994f1c8fc355ffcf5a8b