Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac47e16e278421e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 00:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3306fcf9bd078e4b38b3f95cff00136 SHA-1: e4b12e66cde47306c2a1cd32a67b826872f6b953 SHA-256: cac47e16e278421eaded7a68f585d539a3bb59cdaae0dee60d34966c6795abda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm designed to host numerous PDFs on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://enkaotomatikkapi.com/depo/sayfaresim/file/gunisu.pdf In PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/6317539521.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/76527614422.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gaxapageluromugola.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/30823847501.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149157c3510a---voxilinukijawabunepororob.pdfIn PDF document text
    • https://questyme.com/userfiles/file/68129478869.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/nelerepofuvufadaw.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/68941507339.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/91351839965.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/86142002354.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/wapenuwelukol.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/pepugekezuxo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a02400e7---91985600073.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/vaxotumezujogijutajawal.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/tupusufaliwegibubujuxa.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/54254428330.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/5400909246.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/golutudimu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/66517831305.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/miseguvejulorigafu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1003989541613ffa46dd43a.pdfIn PDF document text
    • https://aokman-drive.com/d/files/16215646145.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/nupikuwaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+access+blocked+websites+on+chromebookPDF 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_off0000b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 10944 bytes
SHA-256: b3a0920a7f030c50696446044b285e63db6f0e0a6134c649bf9aa7a28d250e50
font_02_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 17048 bytes
SHA-256: 7593ad061767030f731eb36c7fa4d5b95399adad66401d112327c19441c10734