Malicious PDF — malware analysis report

Static analysis result for SHA-256 a882c7866fe93472…

MALICIOUS

PDF

93.4 KB Created: 2021-09-16 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5adb49a38a1bc0ddb35a10d51d77186d SHA-1: 0fdf769cb96646a4cb1406787655a2b0c1a6c0b2 SHA-256: a882c7866fe9347291fc92e90dc6fa0dc5799863fe5e5de6bd62f3d6c41cdbff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the document is structured as a link farm, likely to deceive users into clicking on malicious URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dienlanhhonganh.com/images/pic/file/21841571599.pdf In PDF document text
    • http://kaiyudachem.com/filespath/files/20210903181049.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256edae977---muboxafarifojisad.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/44866963215.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/94966648911.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe9a43083---taxoreliludeseru.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/83523430942.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/kilapufila.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/64018220063.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/56903547115.pdfIn PDF document text
    • https://datawire.gr/files/files/menesepikonow.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/23904482814.pdfIn PDF document text
    • http://industra.sk/userfiles/file/1871205245.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/tomukixom.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/85199974978.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/parugulemajedalowomu.pdfIn PDF document text
    • http://mfahk.com/upload/files/libasarivokunug.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/83824702844.pdfIn PDF document text
    • https://harom.ro/files/file/rukatunevumotuluten.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/bafewitozexizu.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/88900158921.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xugepesafuxepusano.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/46491977939.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/17367980236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sao+alicization+alice+swordPDF 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_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 19956 bytes
SHA-256: 81302ddd57c96ece2e1f552a178720ddef2acdc59a68ee735b32e3310cc9f477
font_01_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 10584 bytes
SHA-256: b3563cf3622f7bb5a0143bfeaba586deef85d7e28c7b5c2d05e342da91bd6da7
font_02_sfnt_off00014ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1