Malicious PDF — malware analysis report

Static analysis result for SHA-256 596ec63fc84fb76d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 475b642cbc1bc3292c00c8d05415ce39 SHA-1: a203d8449bf07ac4a1f8d045d12c90a73190c1c3 SHA-256: 596ec63fc84fb76da5672f480ef3cab29eb289e10231bba30d89c3bb70144a46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=install+ppsspp+on+ios PDF link annotation
    • https://ikuseikyokai.jp/ckmedia/files/zifodifakajokumarun.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/81856159091.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/44765750919.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/zaraz.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gudobipijupuwad.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462f791a805---44999078301.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/ravikaz.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/45065159153.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/72894816392.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/73169944708.pdfIn PDF document text
    • http://sivam.pl/files/file/50228333533.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/fexanimesaxapegipasumad.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16312700311197.pdfIn PDF document text
    • http://katachizu.com/img/news/files/26791195231.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/xuxiwojopu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acb16f229e---77090638372.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/zuvidifegitudupalinajux.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/85577615529.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/furerigenazagugumizel.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/72409284439.pdfIn PDF document text
    • https://felicityokolo.com/file/gutoba.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/rugadosiwese.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/8610335302.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/51761656554.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/59111483963.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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 18584 bytes
SHA-256: 7ecb1f9954894ae1accbea2481fa8cdc8c37fae5b03385f5c87e9006acb298db
font_01_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 9964 bytes
SHA-256: 2e67a57045edc737cbb0d6585aa263432fe03a0c6902ad3d8826c75fcf919420
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1