Malicious PDF — malware analysis report

Static analysis result for SHA-256 a196499a89f99e37…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 12:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc5b2b641aa69cd58e55c3319f5b1737 SHA-1: 0c233ce7e712572b48fcdd1b9b016a35d1064095 SHA-256: a196499a89f99e372f0a7f1e149369be6082c3ef19a9e8354e1b7078b75ba8b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ahxxzx.com/userfiles/202109/file/lagijususegomikar.pdf In PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6046sus9gt4kdf0dkv1973hkul/pexadenolopitubivobedo.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/44227681563.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/53485758195.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/bevodawuwejofosi.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/nuzikoroxi.pdfIn PDF document text
    • http://xdankfort.com/rhnew/file/48164778668.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/xexidu.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/17242463282.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xavesafuxopewi.pdfIn PDF document text
    • https://ratoempat.com/contents/files/bebewuvijomebedovugakul.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/gomexipinekutesusujumupu.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xinalesaj.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/54785199016.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8da6591e5---54964468116.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/50504242608.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/wajofagefenomufulal.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/16418020559.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/gujipepomegopedifo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/36415205303.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/xobemidalufetigaforujen.pdfIn PDF document text
    • http://rsst77.ru/upload/files/53350645271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gulliver%27s+travels+by+jonathan+swift+book+pdfPDF link annotation
    • 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_off0000ac9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B0 15256 bytes
SHA-256: 7080e95806b6009d7391d5fdf9cf911ab083a213ee1c34bdc4b7140aa982fac5
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 11396 bytes
SHA-256: f098126447f7af61d646359dd93dcc25cc27441b3da6abbe243eb87b428e7816

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