Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b82c9114fb177bf…

MALICIOUS

PDF

67.6 KB Created: 2021-09-18 04:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47784f83499dc720548c80164d044b08 SHA-1: 0ea5b4037676cf9c0f97a1abf48243cc31ebba44 SHA-256: 8b82c9114fb177bfdf50809702ae43b0b4d2974cae26b0e05058ae477be1ad88
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, containing numerous embedded URLs that likely lead to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the structure and embedded URLs suggest it's a phishing or malware distribution document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://medicapoland.pl/uploaded/file/xosonem.pdf In PDF document text
    • http://tuanayapim.com/rsm/files/28441172284.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/jotezoda.pdfIn PDF document text
    • http://th-hl.com///upload/files/35126605553.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/kogijovapino.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/66178705111.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/45509362235.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb80d04766---69774478586.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1re49ao0fj0uagrsr3b7hr1i9s/50466019445.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/38784326039.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51631030499.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/29119946631.pdfIn PDF document text
    • http://gewald.ru/content/Files/refodomimolepuma.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/62451773511.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/kajaduneroravezugemab.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/vexipi.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/siwika.pdfIn PDF document text
    • http://kgmda.com/upload/files/87811727158.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/pilovuxewekubi.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/95000202462.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/vokusibanom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=positive+and+negative+effects+of+social+media+on+youthPDF 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_off0000acac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 11104 bytes
SHA-256: f960cc0ee3c8453835cde86eb5945ce87caf60f25717693478f426865753c58f
font_02_sfnt_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 13952 bytes
SHA-256: 47f4bbe67395edbb788b3e66289a86249dcd44f3d9536408ab1fd19e5bb71ef9