Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a2ca4097f35922…

MALICIOUS

PDF

81.7 KB Created: 2021-09-24 23:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1043ea83a3e3a56c34b1054d3489db8d SHA-1: 68f042bb1b5e2ab6a049da7e4d9e86dbeab1837d SHA-256: 89a2ca4097f3592236f701b94552eef835cc73456f94edc43b5d43cefb87cd7c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially suspicious domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/buraremob.pdf In PDF document text
    • https://lesrimaudieres.com/images/uploads/file/nomunugez.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xomezofemoputelotutebu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/15732242856.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/busibakatogaju.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/78353263257.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/sikazupivovoxofatuxipused.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kerisofunekamewejewuvobi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613169a65e2f8---wejejisokuvobasozu.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/puroroburetitiresixot.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/66891780648.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/45270567994.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/67343642929.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/rorafam.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/wejag.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/73340256913.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/majozefabevukupe.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/degexedenoj.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lapapitej.pdfIn PDF document text
    • https://stauber.lt/images/files/43865267363.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613646dec2d95---linajutifalisewezo.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/95232595662.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/tulojosumezerexiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sun+tv+serial+list+2015PDF 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_off0000d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD591 10648 bytes
SHA-256: ad74eed3a93047e19577316acd7a83e4fc732d1f6311b29a81f7652f941dd4f2
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 19360 bytes
SHA-256: 440ce827a582f3a915fa4cdc4dbd7f1e81353fa97510f9646896d12f67ea249d
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1