Malicious PDF — malware analysis report

Static analysis result for SHA-256 c458c58e94e8f065…

MALICIOUS

PDF

69.1 KB Created: 2021-09-19 02:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 463ad3b81790372c67ff180ae319312e SHA-1: f572854d36ed1bcf63e388b25de8d5bda70307c0 SHA-256: c458c58e94e8f065183c2ec9db40b1869c17f2e7a16c3bba7ed851425840c614
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, suggesting an attempt to redirect users to potentially malicious sites. The presence of embedded JavaScript (T1059.007) indicates a mechanism for further exploitation or redirection, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tractorpulling-emmeloord.nl/upload/file/zafasekimesejejanaferuje.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gukafal.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/gorojisosawufow.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/98652840563.pdfIn PDF document text
    • https://fong-cai.com/upload/files/77939537195.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/96003446559.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/12102827573.pdfIn PDF document text
    • http://bluebossa.pl/files/file/87559841939.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/45298346372.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/51786012091.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/zukajogirixenevob.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/dewenij.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131b35a310b3---11385840849.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec18addd26---jugoketudokomadesuveno.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/bakedivixobozosogamir.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/sejefegosamipurejoluxa.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sewiwipisinexijof.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/suxapizosiluwuluzubonorof.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/mepudipatuwezi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/72205231190.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/71313917600.pdfIn PDF document text
    • http://knauto.com/upload/file///vefapiguju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=digimon+android+game+free+downloadPDF 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_off0000b0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 15080 bytes
SHA-256: 5b72ffa5d04ba731f1760802589882e93c4868a82483a1018af8a8c176d5f680
font_01_sfnt_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 10516 bytes
SHA-256: 0c61cde5b2aa2b3b2a30cdef84e51e509f61945d7da74fe0584cf194fa70cdb7

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