Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac5e05eaedf9724…

MALICIOUS

PDF

100.2 KB Created: 2021-09-08 15:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f88b30420d9e9f9b04baaaeb4c37de0c SHA-1: a5b47d43fa16b0980d15a2cca204049afc04419f SHA-256: 8ac5e05eaedf972441c84286e16cdc1c5d67532da341c217b5eca5c209893138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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 http://alajwakh.com/uploaded_files/userfiles/files/virusawekupivo.pdf In PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dofok.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dagolosiganubugajum.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/45610323988.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/56258157761.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/48256165081.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/bafavopovoratosatodu.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/kivotelixoj.pdfIn PDF document text
    • http://logicamail.it/draft/media/jesojinimoxab.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/23450842032.pdfIn PDF document text
    • https://landi-bg.com/images/file/sizapuxusamazifedejigera.pdfIn PDF document text
    • http://kbchina.de/upload/31188847775.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/pusutobexo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/kufukixejixodan.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/kazuzoj.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/57414939480.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/pubugodobonad.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nomaga.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/12260766398.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210902170446_973451337.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/48021958693.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/tutab.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/75959571533.pdfIn PDF document text
    • http://specialcats.nl/media/files/53502568562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=autodesk+robot+structural+analysis+professional+2015+tutorial+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16280 bytes
SHA-256: 2874fc24d77d8236882b6174de008700a3c089fd7e0609b7b9d1d0245da37de7
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 21912 bytes
SHA-256: 3e1a0cddcc8e702fdc62aabf95786318b968f583a5b28157dc8031d14a7e27b2
font_02_sfnt_off00014332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14332 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_03_sfnt_off00014bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16412 11468 bytes
SHA-256: 62d8291a8d9e5a6f5a9f09d535ef2995594c1b76ea6159c419dc257ccfc54ff8