Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7aa4fd66d7087a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 00:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a7834b976199fe2d32eef91a4bce555 SHA-1: 369e6c2d985e93a4c1207583cfa34823a76ca961 SHA-256: 8c7aa4fd66d7087a5048e8080c9b5f5f86d8064dd0b02d7362c5f11c0ac1631d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=top+japanese+games+android PDF link annotation
    • http://tehnicgaz.eu/files/file/40444264607.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/muzaporofekuda.pdfIn PDF document text
    • https://laser123.com/geektic/files/gedir.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/12196231738.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/5533730513.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/risabajul.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/82899709573.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/wiponagadisasuned.pdfIn PDF document text
    • http://frchem.cn/upload/files/zubuvem.pdfIn PDF document text
    • http://getem.eu/files/file/43372144894.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/fonosiwijus.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/6286566675.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/mezuxuxinefuxiwibovez.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/mogozafuturagime.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/taxiwadit.pdfIn PDF document text
    • http://medrea.ru/upload/files/64858595025.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/fezutov.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132fda069a23---90815033500.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/roligodaviduzewoxo.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/65981806185.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xotizikimuv.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nelelebuvutakobotoki.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/48373943590.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8ih5mke6kv9a9le6nqfn02mcf4/kajav.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/35003814879.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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10684 bytes
SHA-256: 16ddc665f3f720704cac485131d78fdd1b4c217100cdea4bed66b475b7be9bf6
font_01_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 17024 bytes
SHA-256: fd2d6ed000a0eeef6c49c6316606ced812421d18a4fac410316a323b38181ec3

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