Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd981bd19179924…

MALICIOUS

PDF

76.9 KB Created: 2021-09-27 14:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45ad1faeb1c923b2fc9938c65561526a SHA-1: 74ab70eef2bd397d15d97184a18dbd115978534b SHA-256: abd981bd19179924f6dfecd68065dc8f95438a9351004989e28f7ca588feb3bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=tony+hawk+pro+skater+psx+rom PDF link annotation
    • http://konferencii.org/web/uploads/assets/file/82362100374.pdfIn PDF document text
    • http://allier-genealogie.org/File:/64585773081.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/demabixadimitefivuwo.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/mimurunoralumufu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/tativovuzepegafital.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/roxujafizijeruw.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/2771269993.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/xerox.pdfIn PDF document text
    • http://4tyres.nl/public/files/pororibomemuxamokogominaz.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mojatugateguvozadijupul.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/10047765907.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/87639059231.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/musotozarigelilokifedaz.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb991e8d6---tiveriwokoriditur.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/jorizizefimaxonesum.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a60923bbf---80388791374.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/peposasepi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210918172949.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/27800736656.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/13954876437.pdfIn PDF document text
    • http://sushi-belovo.ru/files/dolofut.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/88344921330.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/piwadijosuvetuxadilu.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/15993855357.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gudabu.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/35746508540.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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 20716 bytes
SHA-256: 02e32edd82ab67091338718fa1195a46aae7449d49c0c1af6d625550b341d06b
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 10736 bytes
SHA-256: d746e57be5dcc3b41af5bda110f256d63b7b2cb60a1153ef31cf2d5c4bb7ec42
font_02_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1