Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a253e01099a1438…

MALICIOUS

PDF

72.0 KB Created: 2021-09-13 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae18c7dfce17d3a8448bacc64f468633 SHA-1: 0f4d0e68a6ce3d03b7c629162810380c63b25949 SHA-256: 7a253e01099a143883e2f3865b5a3c0e3b8ede4a291c2317d98d78b8e706407b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or scam operation. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=redmi+note+9+pro+message+ringtone+download PDF link annotation
    • http://babijie.com/upload_fck/file/2021-9-2/20210902220533903585.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210911075912_sryd4g.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jisenamulaxexuba.pdfIn PDF document text
    • http://carbonelite.ru/file/marupukemosivujonek.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/xejipinedusosijabi.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mezigi.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/60309629063.pdfIn PDF document text
    • http://esistore.com/userfiles/file/riwunegewegaseninexikexo.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/12449411313.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a87acbf5b036199293a86f1078d03d0f/80500952386.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/mivupakulezu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/56457412286.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/kemafazaratedonuvitafure.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///bepipudidunedofot.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/geguxago.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zetemapagexudiranapaj.pdfIn PDF document text
    • http://chicopharm.com/upload/files/xabofurekadigiraxufit.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/84921203971.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/siwubuxedasenalineze.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f7eae9b0235f0288efd719db4e19a18f/77401519376.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/4321702091.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/motumufazuvidukokuwuzata.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/51978888010.pdfIn PDF document text
    • http://fitviewer.de/files/file/31842989399.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_off0000b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 11036 bytes
SHA-256: 1c537b8bf7773525497b671aa1aa4605ddbbff2c9afc9d40964a41b7a851dacb
font_02_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 16292 bytes
SHA-256: 88946fd0c52f63588869f79ae12a46fc13bfc2dcb2ba8799d6a29a2a02f3f7b2

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