Malicious PDF — malware analysis report

Static analysis result for SHA-256 282f345aaf2d2f00…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 02:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d8a42ee9d9a140a22e7c5e7fe7a12e3 SHA-1: bcfb33bb20dea06ba454255e10280efb85b344c2 SHA-256: 282f345aaf2d2f00486fd3f70ec674731295b0e7ca5bc9cae79375fc293c6c16
134 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. Heuristics indicate it functions as a link farm hosted on disposable domains, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://oryginalnedekoracje.pl/userfiles/file/97326829370.pdf In PDF document text
    • http://cartopack.be/Images/file/ragurilejelabulu.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-10/20210910091946262808.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/tusifigifixezupuxifutub.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/52043767954.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910154303.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/kuxomopa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/044bb011693bb1247f35d2fdb670ee9a/84157587436.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/pupokumumimugemikutobum.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mipipado.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/40810035723.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sakuxududegowurag.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/35130399997.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/89666623580.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/17989853477.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/taperizevek.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wevigumuvoludaf.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/zawiminijojimis.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/xezivelafuludajijomikeva.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f783ae827---vawutuvilot.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jasogodexaxoxekudatanosi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/8274871348.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/91420296194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+privacy+lock+app+for+androidPDF 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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 17380 bytes
SHA-256: e54d5538359a9f24590a589998e08bdd959b15d82dda9b86449974471daa9c11
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 10936 bytes
SHA-256: 1fda06c2e685759e50cb493cc1e4d8d9c17489267a476d8078017980efa6c21f
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1