Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c16fec6b133894…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 04:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 775f7ebedadab0eeddd94ba07379f0d5 SHA-1: a66afdc46a97245df80ec09a9e3b2b68f869f63d SHA-256: 11c16fec6b13389402f94b774d3c42fbd35922fcd932b708102c99412d4c9710
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to potentially malicious content, suggesting a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://techielingo.com/fck_uploads/files/76365927857.pdf In PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/2782059649.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/45191343046.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/83790213122.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/50284193831.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/7126963351.pdfIn PDF document text
    • http://chinahongji.com/d/files/66035584126.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/18905774550.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/61773426927.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/92875448693.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/dokikajiwufokuverav.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/88138715650.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/18183424558.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/31837917389.pdfIn PDF document text
    • https://bnovum.hu/downloads/82479938948.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/11c861637f48b8df3b3f078a956a22cf/denododuton.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/nupuvogego.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/jirosunako.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16140761017882---34359503812.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/dizewapiwonevixobi.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/47629437259.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/23865932333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=thoptv+40.0+downloadPDF 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_off0000cde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 10380 bytes
SHA-256: c48c72d61f373274df33e1709db6f0c5c0adb92790c4c52be724bb1e7c6bc922
font_02_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 17452 bytes
SHA-256: 0e5a61a9b7aa7272b2514292aa0145d19bf7da73a8e80609b84cb1b8a28afd49

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