Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec6589e216cbfd5…

MALICIOUS

PDF

96.1 KB Created: 2021-09-13 04:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfc98eaa37186c395a7cfec4e645703b SHA-1: bb0e626d583f1db8dbf7f7d1d58c60f1ad89334b SHA-256: 4ec6589e216cbfd5490cc5da5a0724b890d87706b4bad41a2e576c63484934e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were directly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://digbijoynath.in/uploads/userfiles/files/99284454646.pdf In PDF document text
    • http://maryalo.com/userData/board/file/mofokufasedavifi.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/kekem.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/tusekedewujabavubus.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/68290059247.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210901_074624.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/68268983486.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/bexabafize.pdfIn PDF document text
    • http://htygroup.com/upload/files/maxowupuvaxewibigobogimex.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gusexoreruxuxujun.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/887611880.pdfIn PDF document text
    • http://dmkert.hu/files/file/pajujugizevu.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/jibisutonomodikuloxisi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/41ea8e9c73c6875dbdba7ef08f86b87d/45277901346.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/12524787444.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///29130683175.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109121626242419.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vivudepufuwid.pdfIn PDF document text
    • http://travellerisland.com/files/13731605880.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/jobapalogofuvejuw.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad2c23dca---95505620771.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jufejebojirelifip.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/59433601292.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/26113532802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=me+him+her+full+moviePDF 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_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 17856 bytes
SHA-256: 3ccdba63bb3d14510e1275f459d9376d46aa4861838b38104c488d74c4ea4c22
font_02_sfnt_off00015c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C07 10104 bytes
SHA-256: 3d79de5a9ef3e07da0d9bdf197c41f0bd286a24bdfb71ba28e39b7b865b53bde

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