Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8c484bb6f70854…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ad3abd1bd61dd409dd4d5182742d1ab SHA-1: e6315dad4cdadbaef408401af445dc77522dfb9d SHA-256: df8c484bb6f708545ab8289b3fa779ae2928a9c01145804ea4cc0ea37a6b2d7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://philabc.ru/uplcv?utm_term=korean+grammar+workbook+pdf PDF link annotation
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/xedopefewisibaze.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86013400054.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nuwisuwupifoxirebilolap.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/laxovokefe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/aecb5b7223ca63a24f7be6d7ebfffb89/juwubaze.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/dukoxesupa.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/58810097866.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/kosol.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/27960011611.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/24726396037.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/6206677998.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/6774269459.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/97394662993.pdfIn PDF document text
    • http://videocycling.info/files/file/51310177747.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/mesumexavijogukidasokumiw.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/29549194981.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/62716702810.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/wopati.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/69852174802.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64126505028.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/16818343813.pdfIn PDF document text
    • http://artdental.hu/editor_up/26182886399.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/rutiwinoditumakogasoka.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/manuxad.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/37111201272.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/8282398551.pdfIn PDF document text
    • 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_off0000b802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB802 10748 bytes
SHA-256: 1196a4ccba716ba864113a2f40bab575cc407dd5cbeea3116facd7e73c300915
font_01_sfnt_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 15000 bytes
SHA-256: 86323c492c534f7df70c655d1b636533eaccf2d431da8844ca14eae6e7d8103b