Malicious PDF — malware analysis report

Static analysis result for SHA-256 396e2987c694f6ae…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 01:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df9a5ff5ff5ce197ede54fc796a685d2 SHA-1: 5d26ebcecffb6d3468d82ee2daba716fb227327d SHA-256: 396e2987c694f6aec1a5219f355b046538a7983871d37472affac37f731f9618
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document as a link farm on disposable hosting, reinforcing the phishing lure interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=fun+io+games PDF link annotation
    • http://goksirkrupskimlyn.pl/img/upload/files/fireso.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/12640737887.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/sudakirufapuzeleli.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/61627948124.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/34696319247.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109130207101050.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/29849809154.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/worebojovimijogipo.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/49734913604.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/38560427886.pdfIn PDF document text
    • http://chinazzjx.com/d/files/50995412027.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/memobefedodopazif.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/medafe.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/45079129165.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/venutinoreluz.pdfIn PDF document text
    • http://geasit.it/userfiles/files/divinadisotasevo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/xexovawijus.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401f98a41---85473204239.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/janutipademipeg.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/edbd3d26e6fd5fc97343884dd17f660b/wofujodubona.pdfIn PDF document text
    • https://nexapos.com/upload/files/49778409096.pdfIn PDF document text
    • http://apcmagon.com/userfiles/2055351600.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/49186282866.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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 10284 bytes
SHA-256: c03bac4e49376ea6125878b231871045be913fca7bd378a5b676dd6d9b6522e4
font_01_sfnt_off0000c8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BB 14856 bytes
SHA-256: 3eb93ff5ae89288eeda714218b583490eb68c0f30d396281c34d05d53d7770e1
font_02_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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