Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d36ea64600efae…

MALICIOUS

PDF

104.3 KB Created: 2021-09-14 05:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e707db18b185c21222f9d0d9fc7ea1fd SHA-1: 2adf6171844696652d2398e4d585b132e11ad2c7 SHA-256: b1d36ea64600efae2b04dea77b511fa24ec5d60f18b90b7c453d8bba31abdfee
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of many embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://mkycc4.com/kycc4.com/userfiles/files/rozireka.pdf In PDF document text
    • http://dungcumaymoc.com/Images_upload/files/35828169475.pdfIn PDF document text
    • http://sbairs.com/datas/files/mepizusolomupulixikad.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jejijezez.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/jufugikejaderikotiworugo.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/5135357499.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nezavavusawimo.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/47467705853.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/puduxudikenedazorofivepo.pdfIn PDF document text
    • http://strandedtattoo.net/file/43905251720.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/dulosaxiwubete.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zapekomonogibenuve.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109041306249477.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/2712580832.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/36766041831.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/domulepit.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/vaduvutazowibapege.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/38364810733.pdfIn PDF document text
    • http://chemicalengineers.ie/images/92592561053.pdfIn PDF document text
    • http://4rrecycle.com/files/file/51430542797.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/pibegivanif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kano+new+mortal+kombat+moviePDF 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_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 10476 bytes
SHA-256: 69d276e93a5b6b510c82cb662a96d9e7818d0784aaf77b1f1d494e407b859ede
font_02_sfnt_off0001636b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1636B 18408 bytes
SHA-256: 20e1566164f531d5035ae59ee2cc4f690e7dc024e633a6c692fcb189fc6d88be

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