Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90bfbcaa8baf545…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 23:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72b95d68232eb748826edd452b396837 SHA-1: c48e5fd175ed4fd7def22ae73f3eae9a80a2c2e4 SHA-256: d90bfbcaa8baf545431e0d7f5531f04f4bc424fe09a1de1a758a255617d85d72
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains or link farms, strongly indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=iphone+airport+utility PDF link annotation
    • http://colafranceschi.it/userfiles/files/fagarisadavison.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/katuxilejenabatedowuwa.pdfIn PDF document text
    • https://bursac.net/userfiles/file/virijukefudujukeviri.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/nifikenamifobabumelexe.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/rufokanobiwaru.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/majagiresazigepimuduw.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/80426743399.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134482983be6---teguruv.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/76450982134.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/wasej.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/441165371.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/genoxarofanelunedel.pdfIn PDF document text
    • http://dhf-china.com/d/files/filuxa.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210909035622560400ebk9o8.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/nopubazogazerolabu.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/kadebumow.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/migepanibadivugedelab.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/43402192538.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/gatijijezijodobalow.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vidixuxamisujojewodeve.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/kudakejefagiweg.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/39698230075.pdfIn PDF document text
    • https://actorconseil.com/files/file/remisosolakig.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_off0000aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFF 10344 bytes
SHA-256: 24edfecdf37abcaab9f8e47c2834295afd3a12d45c351a7413bfac5ef9ef6f0c
font_01_sfnt_off0000c645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 15612 bytes
SHA-256: 58b3232e9217ec233ac26c755ab91008b6d7b4ac2ead7bf416ca3b3b36f3b338

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