Malicious PDF — malware analysis report

Static analysis result for SHA-256 e252f05327139a72…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 15:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbdbbc621218c76be5aaa0405147aeb7 SHA-1: d9d01b41ae97fac7a77cd103148e8f166aaeaca6 SHA-256: e252f05327139a72686029c80b5252c8d6c67d2c43b2752c59a1d45286c0d075
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also acts as a link farm, hosting a large number of external URIs pointing to disposable domains, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://garglob.ru/uplcv?utm_term=book+the+one+thing+pdf PDF link annotation
    • https://profm.hu/files/file/85682772549.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/judikalobifetuxavetupa.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/72357888373.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/40866636029.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lijonikekoxetomiv.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/54993152175.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8573ba9a9---polusivijuruguroragatiraj.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/gukisosusalaxugas.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/95910392414.pdfIn PDF document text
    • https://senegal4d.com/contents/files/92525929671.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/bujuzenobonamezu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/bijukapizevosomufaxopo.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/taliv.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/luxenulole.pdfIn PDF document text
    • https://edusfera.pl/upload/file/jomaporolitomusif.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xizopubixijexerinivivuro.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/gupawi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a38e1df3e---73822484016.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/94034945800.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_off0000c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 18016 bytes
SHA-256: 7d4bee9ab7100284cd22c5e1234776ebd81a4b49fcd0a6fdf653b7946d6fea5e
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 10448 bytes
SHA-256: 340e0f60a83e37488364891a06ae2a526b650d47b092c0fa8e42bbe5ac88a0cb

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