Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69e1e0fac593214…

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 10:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4f1fdf0e5116c09205745d04dfd5aa7 SHA-1: a404774371e693c86cfca5b70881519f6943cf64 SHA-256: b69e1e0fac593214b3b7f6a34e340d73fb183316a522b88aa7f1c90ba035f3be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or redirection scheme. The PDF structure and embedded links point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=virgins+diana+gabaldon+pdf PDF link annotation
    • https://faktxeber.com/resimler/files/sodagijetoraxapag.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109022133061146.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/duzulugek.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/desusibafubesifimata.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613146f1ca7bf---43018975379.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/23091029958.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/mexobupivudufofagelilez.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/35673500548.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/foxosugibuvixuwisiv.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/wenukabemelitajiza.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/33409404296.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/73210062720.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/9748546165.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902040111427520.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/56557742063.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/63110346467.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/42229354685.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/gevamuxupabamok.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f060e6ace---52242911625.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/22294972864.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/82051130389.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010718145689.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/9880429809.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/71488773106.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_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 18420 bytes
SHA-256: 170a79e9a932b1dc5d2dcfa09cb6ec500615e63381287042b81763e6cae0fb1e
font_01_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F04 10552 bytes
SHA-256: a12a92c998211798693e3ce7210f35e0856a2e05fd04b56cc164250bde73b48d