Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b41ef3ff26264ce…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 563ab1ed106ae23c7c7ff1bc3136f81b SHA-1: d938a778bc54206831bb4646106a3ecc01cbdab7 SHA-256: 9b41ef3ff26264ce64bb5b99e77c361acdfaaa8e8680d8f1be670185b19095fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cahayaapi1.com/contents/files/13390278891.pdf In PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/13856678830.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/gatararogufedidukob.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff1585ef09---48222479687.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210905_085414.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/22807165179.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/79390370304.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/23565856318.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/16649878550.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161430114574df---gijederulisewozogew.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/tekan.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/8175736208.pdfIn PDF document text
    • http://goref.ru/files/file/nomope.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/figalimapekajemimegeri.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/30365639098.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/torafexofogigafonutev.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/88492299018.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/betewi.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/gumes.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/6182501651.pdfIn PDF document text
    • http://platcometals.com/images/file/33897120841.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/nukuvoribajogawido.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/92255866683.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/82466531719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+king+of+fighters+allstar+apk+modPDF 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_off0000c15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 17380 bytes
SHA-256: 825fc907d8b1c89f2d2d501a0a2af87b5d3e257469f5ab17ccea27185e842c81
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 11000 bytes
SHA-256: c1544f466ebdc82c67f3b2abb997b3ba1f1ee737899c63a2d93f36723a792b2a