Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ac599a32911c29…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 08:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bfd1d5aed35b580f6ab86d5f19fbe5fa SHA-1: fdd1621954148978631841945eb1d8df83eb043d SHA-256: c7ac599a32911c29ab0a53c9aad46bc2c3a687fc0125919f5deee01122a0f1b9
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of many external URIs points towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=that+start+with+s PDF link annotation
    • http://fulns.com/uploadfile/fckedit/file/1631693707nmHB.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/72223126154.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/50f137906926d35b13d727ad8a013655/38672232303.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/23950677884.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2a817333557287d419b3c8984350161f/59357011847.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/80086364864.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/puvixewol.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/29518286468.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/65785023044.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/77007008179.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/jujus.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/tigisixavovoxusibozap.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/foxipibuxanibebu.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/lupetofolireliwejibexot.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pajitowosebod.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/jixexoniseso.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/23548790628.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/nokuduwudafenoz.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/88557954110.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/lozamozedeboveg.pdfIn PDF document text
    • http://unseretochter.ch/images/file/rozeragufaluredo.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/tedajitopavalap.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/93308270577.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_off0000c334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC334 17244 bytes
SHA-256: e24e7d59930c93537496cb1f64e2e66ba8b5ea40c7f18758f1718b0100723ac5
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 9852 bytes
SHA-256: 6403cf9077ef3a249ad3be367ce78c60913b5cd6e5304ccfb4618fbbab55d94c