Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38e1ebf389376aa…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 21:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23f445ac79a1faa55891b876b9e1c3c0 SHA-1: 0f3362ac2c6966c303bdb7362e04a1fabee6b15f SHA-256: b38e1ebf389376aad8a7a29d5689bd4b32236235506f34df9e8ea90d311e0af7
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of urgency lures further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=textbook+of+communication+and+education+technology+for+nurses+pdf PDF link annotation
    • http://lakesnwoodskerala.com/uploads/file/95209347891.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/lezifasusunobakoj.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/20022513754.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/48838208325.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/kojum.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/fosipatalukujezakavovaxo.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/satud.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/gevazovusulun.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pizebe.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/fipigajivugiravudafev.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/fuzadofadetesepa.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/96611671034.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/dugupotidigegugidupas.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/14600574478.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/6461203983.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vuvuzumaxotutemoz.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/89398102883.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/pujapakivedawokakoxov.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251658e574---peruselivitipenonewo.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/niratedixowuf.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdfIn PDF document text
    • https://ms01bet.net/contents/files/19814256921.pdfIn PDF document text
    • https://equimat-cheval.fr/file/94964226521.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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 11580 bytes
SHA-256: 90a4ee2657c9b53ae3aa736bd9eb635ac50cda013964b09d103fb90b64805c4b
font_01_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 17580 bytes
SHA-256: 755f84b59327aac6fc4b58a311bbbc36a27632ead6e16eeb1181018ff0075150
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1