Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18d6695b5ebe283…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 04:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afd8837a3147bf4ddfb7b81d7957fc97 SHA-1: 3dfe1d923818d1ed5df9d48829572f4f73055d69 SHA-256: f18d6695b5ebe2836b76f2fcafeffafafcc29b317e63f04bf6a367441bd0e84b
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 pointing to various domains, suggesting a phishing or link farm operation. The PDF structure and embedded content are consistent with attempts to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=x265+android+player PDF link annotation
    • https://gulceoyunlar.com/calisma2/files/uploads/99259084768.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/fozubixibibun.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/38949682340.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/lofikejumagonibopezefe.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/janoborikenokurugij.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/73916857603.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/satejosoxid.pdfIn PDF document text
    • https://gilbertems.com/videos/file/2021731257.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1632089197tuwafefodugejivipise.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kedoxudugunepetidedexiw.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109200238501093.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/lojexebusolatojomunoj.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/jusibugajobupusosezati.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614242ae8e819---riwodedonidedam.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bijukedakixujomefaluwu.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/julimovivunopewosevikusa.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/novesogupasavelonepokimos.pdfIn PDF document text
    • https://ksboutlet.com/file/files/45293749571.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/96274614704.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/vasigapodulisu.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_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 10664 bytes
SHA-256: 5a1213022fceadfe4ce76a560883ac144bbf456d67baa8c45333c08d3dcd53a7
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 18900 bytes
SHA-256: aa1ecfa1f29c6603c4056aadd12b498392f10e84587e3ce2c55703d1ee125848
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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