Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e394da26428e3fe…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 22:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6de65676824179602921bc4a3622a1c SHA-1: 608187c1d787c88be53c77a28b9e8b15b96e014c SHA-256: 4e394da26428e3fecdf6260933dc05acaaf127f7c685887f1f7246034d054ed8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that host PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of small PDFs on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML/ClamAV detections strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=numeron+esto+android PDF link annotation
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xurazas.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/javururubixajobolumox.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/tobabivom.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/98074614774.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/75452687400.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/77388149470.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/nasinunar.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jonaponuvilafedipotodev.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de855dc34---zurivetebetakonefa.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/najelob.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/pisigab.pdfIn PDF document text
    • http://technocom.pl/editor/file/fubakibukamegir.pdfIn PDF document text
    • http://brukbet.com/user_images/file/nozozofugusagovemo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b0c4bc7b491554d35caac5640ee9b142.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/zinodarezinobiwixe.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/81063489311.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/venogorira.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/64427094964.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/41759946799.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rurunuvukugi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8aqdbe8pks3c3ivkicee2m2875/sefamofoburamuxotivotoz.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 18236 bytes
SHA-256: 6e662d5d188e2a5e01b6f0ce09ba1719b019c78e5d835bfece1b5cbb761ded8e
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 10440 bytes
SHA-256: f6abb3ef583370890381a188b9e483b8acffb7d274c1555d23e149c1aa7de41d
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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