Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b3a5856b66cf9f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 05:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7993af86ff52379fd04d0c63d0fddedb SHA-1: d637c0f1120ee4d87714dc6b7bc67d74cfb954dd SHA-256: 55b3a5856b66cf9fa08b3e80cdbbd59dbc064da0ca1d94b701bd66d97dfe2c66
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also features a high number of external links, many pointing to disposable domains, and a visual download button lure. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to its classification as a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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 http://iberryhomemade.com/userfiles/files/83428188107.pdf In PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/22314669321.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/17207818306.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/kitojegeboxarupe.pdfIn PDF document text
    • https://digireg.nz/upload/56295402190.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/vafaropimenufejuzolowofip.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b167f7251e---63118186497.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/89775076410.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109081537202551.pdfIn PDF document text
    • https://dellrein.ru/content/file/44700422965.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/dosalebizo.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/86853612806.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/68739364542.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/19775322652.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/92177994942.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/37390253369.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/79871243397.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/37504032059.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/12142416098.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/libija.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/nabesalivezurofabiwexem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=termux+mod+apkPDF 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_off0000cfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBF 10300 bytes
SHA-256: c556d790b93b3a86a02ef902aef898ae76abbc702e695d676c3cbdc3a0cd5345
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 21040 bytes
SHA-256: 7eeb0d429e871d981c57732040447fc7d65f0be943db70ff0d532483143463a9
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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