Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f90afa6b83970ba…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 09:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce8e04022b9c4158927d30025e7d7c99 SHA-1: d70873212d8b622a7d52668284dfc5233967b855 SHA-256: 2f90afa6b83970ba3045ef8ad96d04ea17d110ba0d28e8ce4700b393891cdf71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kleinschadenexperte.com/userfiles/file/mopituwivuzolonazixa.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/efb2b20d325f67dd1176d3b08dd9eb2d/garufazed.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/mogagedivamiv.pdfIn PDF document text
    • http://shophouse.info/images/files/liguzofa.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/67086105010.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/70550363680.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210904_041332.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/domekipifawudufajatona.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bajasosetuzabiwax.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/luximusoturog.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/morolumavujokema.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/lagubavukapawufumuxa.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/20247347584.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/57323097697.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/dozerabofumopititopam.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2ce1f714---jumobabigobimiwagewuxakuv.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jopadifateturadejuxivi.pdfIn PDF document text
    • https://redac.ch/upload/vawanored.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/bonepanusuzatusedal.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/89406747578.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/44097538591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=record+wav+androidPDF 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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 17296 bytes
SHA-256: 9445f6039cd1f410f78d2bf4fecf998b605e18a57b9b7df1ad39f434e7df374a
font_01_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10248 bytes
SHA-256: b2f6b416ea94329acb20880e0b16d98d0c2eb7d1137aba79e9846be025330cac
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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