Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc3ce21b0030c1c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 19:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 910a1a07331646f3b4f002f5e46a1626 SHA-1: 38d556a12d48bc96ecce2bf2e02925658afda947 SHA-256: fcc3ce21b0030c1c9bef91eec95d2c0995c6d28672d9b5e67c07c74400c2fd19
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely serves to redirect the user to malicious sites, as suggested by the numerous external URLs found, many hosted on potentially disposable domains. This behavior is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://artistprasanna.com/userfiles/file/wazegeguxuxasubukopo.pdf In PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/466521893.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8f3467526---texorisedofoxanexozop.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/85717366351.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/87120007467.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906093041.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/22415591528.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/77385897745.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/63025703210.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vuvonakejet.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/41641467746.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/9678268407.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/jajekowasekida.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p7se4glct5jbqidh9mpn4pn9di/ravov.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/65323923666.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/29193659210.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///melujetofugowoviluz.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jiforilaxar.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/fujepanajatisixosi.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fizibeju.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/71521463138.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/11085862739.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/dopuruluwekigebaniku.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/wefaxixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+static+classPDF 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_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 17588 bytes
SHA-256: cbc6443399f214bf810aa93735b1b79a553275b54f79fe248eb9c0e427d6362f
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10212 bytes
SHA-256: 8ef3bf835659ac7c72165a5d27e219f3ff026e6e822c8f497211cfea488387e5
font_02_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1