Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad13951ca09654a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-17 15:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b544516b6015d5cfb52dd7c4d599c8fd SHA-1: f31f2974c875a17a6f8ea7ea8319386fe9a945ed SHA-256: 4ad13951ca09654ad4b38acaf566fa5bb710e8500055a67a7c501668f5253d1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF structure and heuristic firings indicate it's designed to lure users to these external sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rmgoals.com/userfiles/files/suvazubetolotonejilemo.pdf In PDF document text
    • https://westhygiene.hu/editor_up/59439475952.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/37336809872.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/nabod.pdfIn PDF document text
    • https://limadelimon.com/images/file/xitewapogopimeregi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/11371753990.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138867d92e4e---muzutuxizi.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/90269532846.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/lokomevatuzex.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/12343684231.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/wogaxeribefugep.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/82557330817.pdfIn PDF document text
    • http://mdtrend.hu/files/file/79501393989.pdfIn PDF document text
    • http://scsychem.com/upload/files/50529956931.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zozovitobisuzeziwo.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/63497306008.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109072225502288.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/47621567780.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/92503827494.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/varutunapexakokedata.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/31519921178.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/vubokoxaradomadonave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=contra+4+androidPDF link annotation
    • http://forum-auto.ru/data/files/zewiwiditexozona.pdfIn PDF document text
    • 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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 10004 bytes
SHA-256: 4da32d3b3283e934d3b6bbce181999f0608e4a9338fa6a3e01f7077d35c207b6
font_01_sfnt_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 16476 bytes
SHA-256: 73ee07de4933d2bc2e9c4534519daae75867dadb2f13ee5b237204830314fe64

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