Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2547a9406087fbb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 13:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da216a22a16c2138bfc7fcb0b16d51ed SHA-1: b4eaa342a551bba88526476c2c08989bfc096955 SHA-256: e2547a9406087fbbc6373caf33fc7d5ac5b33d7fcc1ca65bed4d95f2bf80b778
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=smali+to+java+converter+tool PDF link annotation
    • http://yuemeism.com/uploadfiles/files/84789432128.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fevelikoderatepep.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/telijaturugesujifovunul.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/laroreregobofogofazivufu.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/zodokonutupemuvajewa.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/bowejibugegomabor.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0a324c29---85492830897.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92474226752.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/33055289530.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///47731894571.pdfIn PDF document text
    • http://generaldistco.com/images/file/84952854253.pdfIn PDF document text
    • http://zaiger.ru/img/file/vobikizofonobekugan.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/letozugugupijefafitoloz.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-06/images/files/77198249424.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906202253858475.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/94ef2a7463be815d13885b5adf668ff5/povupaz.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/60430317351.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wobukavezidiparupipuvu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/45689803486.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/xirokesekuzugasixizut.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109051705065508.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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 21676 bytes
SHA-256: 69d2ee5fb194e181c3e7a2819e8d81556ba1ac1f0e238f469e42fd22387db323
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10492 bytes
SHA-256: 104a8307b77bd0fd5e51fc58654fb3d3372a08a84fcc23f57cadd6105932d1d3

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