Malicious PDF — malware analysis report

Static analysis result for SHA-256 10770516eb27ab71…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 21:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cbf5647f09aaa16b6e879ace8c39299 SHA-1: 010dcfec6f34553e9f11be31926402613aab1e25 SHA-256: 10770516eb27ab71952cdf50c0cf04552b261a45ebeb82ba453afc9f3f560c4e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of an embedded JavaScript stream suggests the PDF is designed to execute malicious code, likely to download and execute a second-stage payload. The numerous external URIs, many pointing to PDF files on various domains, indicate a link farm or redirection mechanism, consistent with phishing or scam lures.

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://forumhrdbekasi.com/webroot/userfiles/files/8861539785.pdf In PDF document text
    • http://j-line.ca/fck_upload/file/bogijeralupanufamepapa.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/vobexubadivum.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/rasunupizeluvudiko.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/36379926229.pdfIn PDF document text
    • http://intertravel.hu/_user/file/vufinazapipiponaparepomaj.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/jeziparivofenejututiveb.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/sigunefowafedogoz.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/83634153773.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/lokidomudukoputivaxiv.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210906085124.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/kiwiwajukifabilonem.pdfIn PDF document text
    • http://analhospital.net/file/files/70067929163.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a3c5169543bbe7b8cde3d846c72430c0/magowusomedewojisuvof.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/4985037945.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/17815278615.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21756967688.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/19540265933.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/89684880333.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/11314857232.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/10522602301.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/nopogazevaxizoxobewolaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+create+a+fillable+pdf+onlinePDF 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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 18704 bytes
SHA-256: ac99c9f63a16896c0f7822d317a6d7c5dfd9dde14229940381a57fb77199a14a
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10660 bytes
SHA-256: 57e99a1d2e5b015b22fff03384f7d0a0363b8e519920bff514238243369a76e5
font_02_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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