Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07b1ce80e939fef…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 02:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85dc9ef1b931ca94b0661af8993183e9 SHA-1: c9584e224d7530eaf95fadf59fef9dcbbd410748 SHA-256: f07b1ce80e939fef3738fff68a2bc46b61d38023e6f43c4b257dc506f57e5faf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the embedded links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://portamarioarchitetto.eu/userfiles/files/72937063548.pdf In PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/fizefenuzipijiwekiw.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/busitarufisa.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/raferasubono.pdfIn PDF document text
    • http://swhos.com/upload/files/82544943723.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/mowiz.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/67523703610.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pudawoz.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/gekatiman.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/44729470678.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/pupagikupegoligef.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/62847358297.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff97b7a8---70249397539.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/kk6kgm941snis3tg4ulephcpn4/fuxariwuxuzod.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/nabitakugivebosew.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/79564981457.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/65852585978.pdfIn PDF document text
    • http://samtekelektrik.com/files/nifuxi.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/98940842223.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/9317657717.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/36340248748.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/79447627057.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wovuxotofiwenuji.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/bewibopugijoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aimbot+free+fire+iosPDF 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_off0000b864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB864 10184 bytes
SHA-256: 9adaab5867340c3f45df38e3552d226f56117feb005490a27575b2c24507602c
font_01_sfnt_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 18544 bytes
SHA-256: 5600187acb157de0ef08a83357536ccadcdac979e2cd6ccb846681777e88573e
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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