Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b497f562a110373…

MALICIOUS

PDF

111.5 KB Created: 2021-10-06 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ccc87d4c4ccba51240dfeaa6f03dfde SHA-1: 1d4478c6193d98ac2d3cb007281d3d7ab084912e SHA-256: 3b497f562a110373cb1cc1ca76afcb42c2545785eff81bbd25b92200d1bdeeca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://huntic.ru/uplcv?utm_term=glorious+mysteries+for+kids PDF link annotation
    • http://advocaatindex.nl/images/uploads/84346082379.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fudaminid.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/56380387790.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/12803822866.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/fexilufititez.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mofupakabitoxevi.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/jatazuvesidefamegob.pdfIn PDF document text
    • https://trainova.com/userfiles/file/lisuvipadolagabebavufiwu.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/70532769946.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/xorelekasifopizupululedi.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/mijif.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/sekosawokadi.pdfIn PDF document text
    • https://nyig.com/files/file/30756649151.pdfIn PDF document text
    • http://devveb.net/userfiles/file/85295371779.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/kudojiketuponi.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/xidunoguzadoxifezanofa.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/namimezusinemeromunuduwet.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/xosakotigofofabuwidunufar.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc714d4e1f---bekinanawafujarurer.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/wuwararu.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/nowedalinis.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/wiwek.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/wowuvelevuronef.pdfIn PDF document text
    • http://ttc-investco.com/img/files/purekiwazatipuvevifuf.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/87722822287.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/rovevudisafaxoli.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_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 10596 bytes
SHA-256: 558eb5deb818a4309a41484c34cf53e9bcc7eb3df54c673709a8a8607553bacc
font_01_sfnt_off00016350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16350 20716 bytes
SHA-256: dd9be3e4afbc97f02064d476cb00cc2ab3ea5bdd24e2d31b82c75927da7ec2dc
font_02_sfnt_off00019831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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