Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f99e203a71187…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 07:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f9ad4a5699d32a557fd408a0b8aee00 SHA-1: 9c97136e02462c8beb2168789c530fcd21ae0d83 SHA-256: da0f99e203a71187bc4ef597e5f33fdaa48b02bcab844747122d3da202fabcd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and identified as a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 https://xn--psg-9lac.hu/files/files/sufubalosojadi.pdf In PDF document text
    • http://com123.vn/uploads/file/jotumepi.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/woxajuvevisep.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/tawigedijewig.pdfIn PDF document text
    • https://dafelia.com/files/41923033659.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/4646158750.pdfIn PDF document text
    • http://hongdacable.com/d/files/34672359095.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/fujugibomajiko.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/vezurifet.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/zejobaji.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/29632617222.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/fesanenujemilofatenapa.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/guganava.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/76353129843.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/kotadiwu.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/45904385645.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/60872333400.pdfIn PDF document text
    • https://ptogel1.com/contents/files/50350263538.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d35a88b5---punug.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vatugivatekerumaxa.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/gawelaxope.pdfIn PDF document text
    • http://wohingltd.com/userfiles/belonepe.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/kesopozogofut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=my+hero+academia+season+3+episode+5PDF 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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 21264 bytes
SHA-256: 14776db22f52ff9aa6b0c3c5c696e5a2a5cc78eb08eaf873805665362fd24aa0
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 11048 bytes
SHA-256: 5d923aeb9f7393fb214e4337379fa1a225b146e6edea5bd16e7b6e6fac37e144

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