Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a9fa3f98d6a400…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 14:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5636e2d9f58913a8b325af5c2987a587 SHA-1: 0c2bfc573ff06036bc1743463778d3807881e325 SHA-256: c5a9fa3f98d6a4005d3cac298bae7a222170a91e130f6cc1e73bf4a4d23310be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to direct users to external, potentially malicious, websites, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://myoffice2561.sesao33.net/UserFiles/File/94637831676.pdf In PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/57096389062.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/48940250423.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/35422451844.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/2016500993.pdfIn PDF document text
    • http://carbonelite.ru/file/54389345664.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/60355720939.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614038add4805---32061502919.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/pakedonajenigozi.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/37806321361.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jovedi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/97284033667.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/raduxenus.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/91985547214.pdfIn PDF document text
    • http://abnicum.ru/files/file/74350827121.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/22024848061.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dojapiwagevonipekok.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/1112211970.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210914_01EA4D21A4DFB542.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/23942971525.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemerapefimapisunuj.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/55061126052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+editor+pro+download+new+version+2020PDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/6698388731.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 17336 bytes
SHA-256: 82bb97b4d5d0b2091352bd0ac2a1107ac6d566c382b65354ed8b183baac5204f
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 10852 bytes
SHA-256: 96f4e174efb182e8eab02d6f7c6b0f69a2f69cf196ad55389a407236efa868f4