Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a262d18f35c50e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 00:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b3ca1ce93013a7df26791a85dfde942 SHA-1: 42079dde4fe0513bdaee8b2e3c572302ceef5941 SHA-256: 58a262d18f35c50eab308a3203f28de9131c8bc08db29faef509fd896c7060e5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The presence of a malformed exploit stream and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the structure and heuristics suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://newtop-eg.com/userfiles/file/dogopib.pdf In PDF document text
    • http://bogaarchitetti.it/userfiles/files/benajimewavipusiluvi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kagulurubozisal.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/89623938601.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/lemuz.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/21353751622.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/14562781099.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zezivezaliliwusatokit.pdfIn PDF document text
    • http://synergyproperty.com/images/files/tewasasut.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/57353663772.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/tegezuri.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090718202873499.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/wofoxakufi.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/35333047934.pdfIn PDF document text
    • http://olympusflights.com/files/files/jupuxupetewovavidunekop.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/noduvakilugevoke.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/81430355270.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/38808442066.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/fikitiwefole.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/10462892771.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/76695163357.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/98760717600.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/69088257003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=torrent+game+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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17380 bytes
SHA-256: d07d6a651a528696c029901174648072a1fde14fead3fec8fdc8b7877e7e9396
font_02_sfnt_off000130fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FB 10340 bytes
SHA-256: d467264e4f3274b6f67b938e8e2423bb17fb6a8d24f1abb774aab65fbb37ad8c