Malicious PDF — malware analysis report

Static analysis result for SHA-256 c989f9b896e31be7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 07:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbe6968fee6a15f3dfb69deaf02991bf SHA-1: 5b84382984582fb6f44bc38b6371b2d42800f097 SHA-256: c989f9b896e31be77dec1e169305140b7e637e71ebc47023150ccd63a99739de
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct the user to open a password-protected archive, a common tactic for evading gateway scanning. The embedded JavaScript and numerous links point towards a phishing or scam campaign, likely aiming to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=unlock+phone+without+code PDF link annotation
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/lelotove.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kubiseruxeritop.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/67196776186.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/26280712870.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091407490779.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/71669651377.pdfIn PDF document text
    • https://asken.as/bilder/file/63510379945.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/3552089193.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/70609159472.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1915913021613bf72fb233d.pdfIn PDF document text
    • http://fourfoods.com/images/files/85810933453.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/89874785315.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qq2l7nq9g3gdouvd96euipe7e4/19963352690.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/99478990570.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/56628515124.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/55026876492.pdfIn PDF document text
    • https://beautydent.hu/editor_up/45650566584.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/45627167623.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/98501888335.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/bitadafogeririnerem.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/vowitegevilipamux.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/8938624812.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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 17644 bytes
SHA-256: 0e11b0495bae8b5020d8b4de22293a53fced20d4f4c2eb46fa842e9c76f92da9
font_02_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10468 bytes
SHA-256: efd129cbe7609c459f7e437f5896abe891ef71673f36ea2331a13a68c8dec3d3

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