Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2e17b0017000d3…

MALICIOUS

PDF

97.2 KB Created: 2021-09-09 01:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: ea437ccc7dfe40ca2fcfdbe68e4a94ce SHA-1: 952a7c882013dfc3d1876e492c867479f42ba9a8 SHA-256: 1a2e17b0017000d3119d6edc2770c6d4f8a952f96883e67a6d08dd2fe238da0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tea-ra.com/user_data/upload/save_image/files/408037576.pdf In PDF document text
    • https://ljlconst.com/admin/images/file/77649157821.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/39807419039.pdfIn PDF document text
    • https://ksboutlet.com/file/files/vojof.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/gorosere.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/6143832660.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/guredominajuxibetisu.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/gixitazijiwefejoxozemizin.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/71872191588.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/notoveritixujozig.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/pubetejobabobu.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/tadovupitaliluvaf.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/siduxadegusobi.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/vofid.pdfIn PDF document text
    • http://mp-journal.com/media/file/kabadozasuduvipozejub.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/jiwoxiluvulagafakiki.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109090625424959.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/mekidebenizemefot.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/bonaloselimalusuno.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/20583207420.pdfIn PDF document text
    • http://masonhn.com/d/files/82117732990.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/99215480106.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/14795970360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=java+gui+programming+pdfPDF 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_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 19348 bytes
SHA-256: a0ded9cc7e88aa677ac06522aa223c7bc04765a811d9bfdc62183bf89d88a941
font_01_sfnt_off00014735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4C 10552 bytes
SHA-256: a4c5a8f7d3423a767eae48e191c41495fef604b990d3519076f76636a70ca6df