Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6310664e7d5621…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 14:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4927326ba50871f481d0b43f081a484d SHA-1: 97bb428102384e904c30f59a18ff52d77d3a4ef8 SHA-256: 9d6310664e7d562123d6d4a5179d6256a3746ee1bf109ac62dcd619b7e630658
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The high number of external URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://albarossa.jp/js/upload/files/29252061420.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/75203274999.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d15d8dd67---83534171586.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/94459661905.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/bomapupixepa.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/jexipusozisa.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/wijofogejori.pdfIn PDF document text
    • http://guchen.ru/d/files/95393335894.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/zovewidariwawa.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/37826726298.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/90787015776.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/51074189808.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gimupizobutabop.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210903214635.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/3231686708.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/8627688001.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/16743101266.pdfIn PDF document text
    • http://jump360.co/upload/files/20210910191422.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/8301517847.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/60362840366.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/1653135412.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rupesozonunovukoxo.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/50610159998.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/botigesowixutitojaga.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/43545849980.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/leranifavowok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+the+great+123moviesPDF 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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 19068 bytes
SHA-256: 0eba92461b769f8c92692791496049f06eed18e2985c622285aa8c9a38475306
font_01_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384F 10932 bytes
SHA-256: 8d7eb6d924db5fa8d9e8cb3151243a4847a0210351806dec56ca082b190ab270