Malicious PDF — malware analysis report

Static analysis result for SHA-256 819ef290628b534e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-28 18:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6129f522430136aa8495437baa2c420f SHA-1: 7b47682f66bccc6130698e7e44b85d64f52bfa99 SHA-256: 819ef290628b534e6968415711f7849eeacfc31af95a406c72e6af4efd82ab33
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=potions+class+hogwarts PDF link annotation
    • https://lighthousemacau.com/html_upload/file/madutuwaxipavijejuluzar.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/ruwigobaleminoripetukiboj.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/35273984195.pdfIn PDF document text
    • http://geoman.cz/data/file/nobufoxigu.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/94061320331.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/risatobujiropifijugopima.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/41672560587.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/sazujusar.pdfIn PDF document text
    • http://ilkemymm.com/image/files/nukobojunumapetaxi.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/zivatutuvuzegoxatokemu.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/93122864229.pdfIn PDF document text
    • http://sdes.in/uploads/80411792436.pdfIn PDF document text
    • http://anindecor.pl/files/file/zotin.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/63024052487.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/pibubixunajiwabogipugibik.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/64567768139.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/bidawakitomofavoxolikub.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/46839132363.pdfIn PDF document text
    • https://lordoptika.hu/files/files/20277204417.pdfIn PDF document text
    • http://congtyvima.com/images/Download/84876621657.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/tibidip.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/68366063358.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/todezepogetuvuton.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/34516911815.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_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 10464 bytes
SHA-256: e6083db00921a92c3d9e5e6350a9b66e8cd3cc507b5853545fca84d0f4d95559
font_01_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 21264 bytes
SHA-256: cdcadfc79a0fa167ede9b029ab6066971d0460d21ee5a9e55908f6ed5962ed03

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