Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2283d9553c227a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 08:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ddcd952948e8adeb72aea72bca78ede SHA-1: 8939b9bc4ffcefb837b9e21251c15ccc3c827552 SHA-256: ec2283d9553c227af855f69e5bf4a963effde6449d7957d246fdfd2cf0a6aed2
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm designed to obscure malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://kayamedbursa.com/userfiles/file/redanoguzojofig.pdf In PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/neragopisixigatopifapid.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/dokunefidelefex.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/4759456172.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/80154156720.pdfIn PDF document text
    • https://2winit.com/Files/files/garonemexixigivokew.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/mosanexasizonunov.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1pv1o5b58re44ig0mhu5od6gn0/52235975323.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210906184746925240tuv0d8.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xewugijitefuranobanakufiw.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/13569369702.pdfIn PDF document text
    • http://irinabailey.com/upload/files/99480924467.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/44702009222.pdfIn PDF document text
    • http://lovesenergy.com/file/vejisunu.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/4305339858.pdfIn PDF document text
    • http://pb-book.com/user_file/file/28316072489.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/77734403653.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/4387791099.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/75157696734.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3d648622212eb569f475bcc625e102f4/66018008250.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/rugusifisuvomef.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/68522803578.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59419739550.pdfIn PDF document text
    • https://bagstyle.uz/images/file/risesidog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nova+legacy+game+mod+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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 10544 bytes
SHA-256: ffb1b60bbc076204b9634a0be52a918cd8dc5393a69e4efc928ecf482b0157a6
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 17168 bytes
SHA-256: c480a7aba7f010978855c52b432880d01b6fbcece9b799d6062cb898f81287e8