Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c046aced6444cc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15ccc829a89fa2d7e1d1c2477ffa02d9 SHA-1: d2ec822e1cea614f08b2ef73212462b8c0a93a5c SHA-256: b2c046aced6444cc959ca128f9ecea91abe4ec9818ac0b518470f068f23e3a38
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/napakuzukiralupamudiji.pdf In PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/29235459459.pdfPDF link annotation
    • http://gazdalkodjokosan.hu/img/userfiles/file/diwerapofivavorebosafazum.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/52807277166.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/girikedavulosakegisil.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/10487124316.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/busetowokivasusokopuxita.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/52182724061.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/13474245157.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/vabazixomuzudan.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7301ba21f---70935962551.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/jabogubor.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/11527890703.pdfIn PDF document text
    • http://bluebossa.pl/files/file/87559841939.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/fujifebakerapam.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/dunapogini.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/midumekepapubefotesunaka.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/bexofurovuregegajezumaxe.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/52970907666.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/fowabupaleroxopeb.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d8822960005addc0631e9cdf9bf474ed/nizisojitusunatepub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=advanced+english+grammar+book+for+class+10+pdfPDF 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_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 11420 bytes
SHA-256: c7b1bce48b89a2d73f65622c57eca36d0cab2ee4b0c998934d6e88fd99eb871c
font_02_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 19688 bytes
SHA-256: a3a7dac4ffe15e463e306cee114e131069f0a54c812fae745b2deeda21f6c443