Malicious PDF — malware analysis report

Static analysis result for SHA-256 78efb2747968306a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 03:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a13c351ab124fb66c00b984af15201d SHA-1: 7248b2510f106ce55b57487631c465fb21fb8376 SHA-256: 78efb2747968306ad467616dbbcff8f6e2778719d00164952931b083b84abe85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or spam campaign aiming to lure victims to malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://we-women.de/default/files/uploads/file/25552916019.pdf In PDF document text
    • http://yanarfabrics.com/firma/files/96106119865.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/88261599804.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/79509550699.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137b97b4678f---lubufuga.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/dilaw.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/8932957260.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gabodulizikanujafatafijez.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/1427364838.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/95788115831.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/93927119981.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xokexaludobujuvuwufen.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/luvakemez.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/bigajebotimoxikud.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/80960750226.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/25408657390.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/1796419170.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/xurolizutusuwidebis.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/61762428385.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/vivifejinepumidinivide.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/89767952413.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/tubijufajekesasit.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/5781212144.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/sakisa.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/gejuxawili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=without+remorse+novel+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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10760 bytes
SHA-256: 7751bbf9794af451b54a3e7eddde5c170e4ef20abfd46d03e10bb4ec286df6a6
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 17964 bytes
SHA-256: 39a818c5697a9c407360a200356260584423dc89515b308391dd7909394b7c27