Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fe89e7ab68c1f2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-25 10:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccda8a218f55929f236fd9587b3da0dc SHA-1: c92230dc4d701e697656a73dcb510dc07aa062f1 SHA-256: 89fe89e7ab68c1f2d5d6c31b2fc02fe70832f3070bb737df46d7a1341ca7807b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://wastran.ru/uplcv?utm_term=apk+cheat+headshot+ff+2020
    • http://daearesort.com/FileData/ckfinder/files/20210905_A55C53A116C81AF1.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/1065501675.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/42235145246.pdf
    • http://newcityhk.com/userfiles/xuzugibemidep.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/fudise.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/18566582532.pdf
    • http://albergocavour.com/userfiles/files/1378749100.pdf
    • http://ruihuitax.com/files/file/vodaxe.pdf
    • http://lednotice.com/userData/board/file/bepapoteg.pdf
    • http://eqletstalk.com/uploads/files/202109060426181537.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/xobewe.pdf
    • https://aquaprosmart.com/userfiles/files/xelizowugivamoka.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/23388603552.pdf
    • http://sor1310.com/userfiles/file/65703342850.pdf
    • https://ptogel2.com/contents/files/siledake.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/xirakulakajatikufufot.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/babugawunogadifesova.pdf
    • http://maulich.vn/attachment/files/mitanuwajanorik.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614087ed47739---58326167756.pdf
    • http://banghetretunhien.com/media/ftp/file/beguzodonutalekab.pdf
    • http://purepoem.com/resource/docContentImg/file/2021-09-07/535d0d7b43ff143ab44689ffd026559e.pdf
    • http://buydecor.ru/uploads/files/56711897827.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/fuwimubagugeduzuvawibiwe.pdf
    • http://raffaelecavazzoni.com/userfiles/files/18205833772.pdf
    • http://nexxosrealty.com/userfiles/files/pefanewefobuwelile.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c319.bin
63b8ab79165ffed9570e14c08232f62c6e76c5be5ab57981901564c1f49ba8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 19792 bytes
font_01_sfnt_off0000f6b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
font_02_sfnt_off00010ecd.bin
c6487d0205c4dd23ee49cc170c747dfed156de92ea7ef18c0bc98b6484010378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10692 bytes
font_03_sfnt_off0001279b.bin
800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16188 bytes

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