Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef15cbb45024f703…

MALICIOUS

PDF

86.0 KB Created: 2021-09-24 04:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee10e93c2edd379f6372897b0024654d SHA-1: a388bb631d9bc0bccced5c79cdc20f475714d6d3 SHA-256: ef15cbb45024f703587326a61a6d44bd503b4becbe19248710981a7f0eeb0ce3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which appear to be part of link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=horny+games+for+android PDF link annotation
    • https://ewt.cz/res/file/28137933604.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/zirarexolopipozaga.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/leriwudigexibafekedexovet.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/mafapereka.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/63844441571.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/52552866328.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/66194110602.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/61929129638.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/sesesik.pdfIn PDF document text
    • http://artediapharma.com/upload/files/wodufafojepidopo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf18016252---38735105245.pdfIn PDF document text
    • http://kleiberit.ru/files/file/mavubijafa.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210923012727_cs2gzj.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210921135808.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/bunomizupis.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/86449769635.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/34764258140.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/69335623788.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/14531777641.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dulesu.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rojuk.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9b966a6fd6e5e17df9cdcf0424bb2fef/24633654222.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/nakamodulu.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_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 10656 bytes
SHA-256: dc8ea85370219ffd46e4fc9107f2ecfc6de15f4951d6eeed9250fd3047c4a1e8
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 17348 bytes
SHA-256: b5359bc7a8976224e2c57d12cb3a1397baf542fead72af374536c1b5b7b0909e

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