Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fa57c85ba0cee8…

MALICIOUS

PDF

81.2 KB Created: 2021-10-12 07:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f960e319819c822d2241a6d5f7c46120 SHA-1: ea0985b695dc1d0c62de935af712a4de4b9d835c SHA-256: d1fa57c85ba0cee81eed0ca4f52047f96b6bd4f8d2d7d18b541218a9294f1f63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, with a high-confidence detection of Pdf.Phishing.Trojan. The file contains numerous external URIs and is structured as a link farm, indicating an attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6f264e41d5fbec22388622a66cf9e46c/kubekifuwumizipodizek.pdf In PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/40081103357.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/7814531370.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca636ae768---13119771093.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/riruwejomesenenas.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/44632735244.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/8328003961.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/xarowetigumojiwede.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/34817431761.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/sisovenezelamotisabamuv.pdfIn PDF document text
    • http://imbirimbir.ru/files/54259215868.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/reguz.pdfIn PDF document text
    • http://centrons.com/uploaded/file/20226454361367902a8788.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/27648868260.pdfIn PDF document text
    • http://baove24h.info/upload/files/jozizoveka.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wijawizulububajadasomed.pdfIn PDF document text
    • https://kawinlari.com/contents/files/modasevolunedimadur.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/90671393629.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/vafapawedibejefikuwaxiv.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/59447570783.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/kenaj.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/nopulipokeper.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=power+of+each+branch+of+governmentPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/58431732005.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_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 18852 bytes
SHA-256: edffd0497aeaa91671f9d0df96974b69dbc5c1212b5d79b548d5ce3bc8bb6416
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 10768 bytes
SHA-256: 9d8aa08c60e5a9519cceb09abc82de40369262adccd785927154d2652eb3bc5c