Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f0a8b11d9c2d9b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 23:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43d7ffffec58d5a999cabc20c410fa54 SHA-1: 9ba2564361207f074db504f83f16c0d28775b3d9 SHA-256: 38f0a8b11d9c2d9b5cf0b923e27cc1e8560fb8da5a74ee8989f547a3feed6603
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://norservis.info/files/files/45533132014.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/36518142469.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/rizulezagejetejoxevitu.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/rorugelube.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83431490390.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fiketu.pdfIn PDF document text
    • https://novitas.ro/files/jogepenekez.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/zosisodolaju.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109090936111003.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/11994378917.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/41529814808.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zemapububetujifetapejid.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/84645935171.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kilaribinorupinewuve.pdfIn PDF document text
    • http://nensi.si/upload/file/61427344536.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/kowiworazebukojawelul.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/36671264487.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/1509817383.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/35612783573.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipab.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb644873f---76131806500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=neon+war+frivPDF 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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 18816 bytes
SHA-256: 325a226018653f05443aaebbc2f46e30bac6210130ccc14b71986dbb90c5570f
font_01_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 10024 bytes
SHA-256: 6832ac632a8e4e2c45c3903ed1eb4e33927f320c877fdf02071758ff7d4f1b2f
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.