Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f27368436b2f26f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 17:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38941ac461a9f409fb5ee9e8456de316 SHA-1: e02c3cf196fa5756726bd8d02dbdf296344f50f4 SHA-256: 3f27368436b2f26f77116b4f4cb5cb28a221f6ffcdea91c3568615fc5941b6ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further confirm its malicious nature. While no scripts were explicitly extracted, the presence of external links and the PDF structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=genshin+impact+free+wishes+code PDF link annotation
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/vudapi.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/borufesigukusorojaluw.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/19667639526.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/42802019169.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/12644413341.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/67630749901.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/mopesubadik.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/botitipijezimar.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/vusudupenudinolevopolinef.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wavumezuforesam.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/vatis.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612effa0b0152---lajizudejozejike.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/9631203857.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/15907891712.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/luvoketuvodew.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pizixojurinorumujejisaka.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/53236430609.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nofogofozamimov.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/62554396721.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/14092892338.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/puvepowijupalexibazuzikat.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/nikete.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/jafabeg.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/dusetirapolol.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/soguzovawosexibatowini.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_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 18832 bytes
SHA-256: 4d2f88b532960dff505676452a88c43f9843264ff785a316e6ba77df2ffaf5f4
font_01_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 10964 bytes
SHA-256: a30cb1dd24ba0484da05f580d98cdfd808574689cb635195c7c1c88c1e7cd1e1
font_02_sfnt_off00012ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1