Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12aa9edf2b9bda0…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 13:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1e371e0d327c7c93c978c2645121e40 SHA-1: f8f7d5df163e1b7d1f3c42494e4e849b8a5b03ca SHA-256: c12aa9edf2b9bda08e9aff97a2a90595398b52e0bca51654ce0a63db500ef1ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. 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 0.9976

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://chcial.ru/uplcv?utm_term=resident+evil+gameboy+color+rom PDF link annotation
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428e83b6556---debat.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/levuwi.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090905525619.pdfIn PDF document text
    • http://tdbm.vn/upload/files/78638876244.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/romosu.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/46007896941.pdfIn PDF document text
    • http://zeci.nl/im/image/49897314552.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/78037775642.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/dipedenoso.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/38815887067.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/37844230498.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/pavasowexul.pdfIn PDF document text
    • https://paradigma.bg/uf/file/pomixiseliwimat.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/86675107121.pdfIn PDF document text
    • https://nasikampung.info/contents/files/goramuvakebavelomuninifa.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jupetosulupiwadur.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/vujinare.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/37700979606.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/24204889967.pdfIn PDF document text
    • https://12shio1.com/contents/files/42481359420.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/51507925909.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/53035176187.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_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 16592 bytes
SHA-256: be4911e0c7e9ad4d4425197f11812a1a03cdb3fe737b6736e266f67ff02b539d
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 11076 bytes
SHA-256: da583b52343a6444531ba5323b63c67c73016b4cccb10d5e1c5cb064087290b2
font_02_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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