Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4dc4e2cf57ae24…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 00:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73ee03286ac6e3eed87135605d4093ff SHA-1: be5672f0009e4117174e75ce1b319db7c5a7fa96 SHA-256: 2e4dc4e2cf57ae248489550619370209c839abec735858552e704f9432813e83
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a ML classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' in one URL hints at tracking, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=what+is+naked+browser PDF link annotation
    • http://tindangnhadat.vn/upload/files/97921394600.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/88026784279.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/14502914697.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70a16a3e5---funowi.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/16168918306.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/46220778594.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m03jbi5gtj86p3g8np4lpa2blf/xexiximemugu.pdfIn PDF document text
    • http://leruichem.com/upload/files/lijuwunitabajog.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/potorekenonak.pdfIn PDF document text
    • http://wuchem.com/upload/files/28160348247.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xupejupewuwalavep.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadagelulabofojarobifoko.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/nexozisegesevu.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/68572137518.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/39274881874.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/51017559974.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/8829601138.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wosofatizokeravujofozit.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/86442739166.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/11764099906.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/50614271492.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wavafuvebaxotaw.pdfIn PDF document text
    • http://henca.com/files/details/file/87593225256.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/5146995092.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10612 bytes
SHA-256: 7c911d49fe1d8e5058dde7dec85fc55a25c8e73ded838ea49d94b6ec8c7b4f07
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 17692 bytes
SHA-256: 8bee516929c53c31fa0e6176ca4691cae8c5c2d091ee1c1295fdc24dc05a3f52