Malicious PDF — malware analysis report

Static analysis result for SHA-256 a024bc204858a401…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 10:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fc67a7805437cff2a179588618c090c SHA-1: a978a230123784f08a432f7531d6598ef1b19689 SHA-256: a024bc204858a4013b5b93eb3be3fa42421a9cf228a8cc3f23dbd9a7f670f10f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise. No specific malware family could be confidently identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hoachathoanggia.com/userfiles/file/januzuzizixopeminuz.pdf In PDF document text
    • http://xutricolor.com/uploadfile/files/74720174567.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/29848457630.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/35345662333.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/34765897353.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bolasapo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16130788b53cee---xalezulus.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/30987848678.pdfIn PDF document text
    • http://cudicio.it/images/file/zusojuvejulixusotaxetap.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/fixoma.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/tojerunutegoketofaw.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/88151908722.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lomezapijawa.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vujikifosukobofikox.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/fizusutit.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/modulugiforuzepu.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/nulabur.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/1974589112.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/31675381361.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/84655696689.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nujenisaxo.pdfIn PDF document text
    • http://dakov.hu/_user/file/fenuzif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+game+of+life+neville+goddardPDF 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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 10564 bytes
SHA-256: 42b8435a3f0cd00e6ed3ffd6cc56d6d80e17588274ea2a226b572ccb5d49bf1a
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 17352 bytes
SHA-256: aca289eb807ff53e203a8a84fa6f1c8b9f44f0fa608a87ca96c439551b44a4dd
font_02_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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