Malicious PDF — malware analysis report

Static analysis result for SHA-256 3559436f29e1cdf2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 18:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7d056ff7a724bc358af96fa32b7dc70 SHA-1: 42048d2391973f0659a2ccaaa74cf5c763acb15b SHA-256: 3559436f29e1cdf2781618666c26c73ea380c3a73161e384c610efb8b1e23c74
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of PDF_URI and EMBEDDED_URL heuristics suggests the PDF is designed to redirect users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://ed-union05.ru/files/file/vagolepudovodugeduvowu.pdf In PDF document text
    • http://gancza.pl/userfiles/file/sugevuvudemozoj.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/kubasefiwejesulaxe.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/51240346973.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/10870844068.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/48151879419.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/57063802160.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wawalaratalapefeditinapo.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/79843260957.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109062217532178.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/padelinolizedot.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/77667132624.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/lipulomutuwuki.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362bf15dc88---xalukojuxuwemi.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/wiwudeb.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/24708927273.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/70651697291.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/81741353926.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908154537.pdfIn PDF document text
    • https://egca.fr/userfiles/file/2161329251.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/12685491643.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/zekalozejifagopuvuzal.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/mivesumedetezuvetoloni.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/zidaloriguj.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/vituwozugoponakovom.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/pokiwopudiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=expanded+form+of+decimals+worksheetsPDF link annotation
    • 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_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 17412 bytes
SHA-256: f878842194ebb17db85274340d8424208b2ed8dc24dea3d2d062f0fb5da4e65c
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 11148 bytes
SHA-256: 366d9339b2c8168eb4cc61a1680213c82c6795ff538d4c95ef1d79b6a5b3352f