Malicious PDF — malware analysis report

Static analysis result for SHA-256 98957f99993e79be…

MALICIOUS

PDF

77.8 KB Created: 2021-10-07 14:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c89e2fdd6357fa97624b86eb00064a1 SHA-1: c9530b3a09aecb4ca64d1a18260383a45f0f86e4 SHA-256: 98957f99993e79bee1810e4abe21dca4a9b57d3cebc2e35ccc9ecdd6c33fad90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

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://chcial.ru/uplcv?utm_term=sat+shri+akaal+england+full+movie+download+hd+1080p PDF link annotation
    • https://storycycle.com/ckfinder/userfiles/files/24543852624.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/buzuzubapofiwov.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/87619721656.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/mofajeze.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614464c49ab8e---52149335559.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/90321958032.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jonototukujiz.pdfIn PDF document text
    • http://ducnhua.com/upload/files/fapuk.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/97499313182.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d565cf0a7b---86303260550.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/jufudubitawel.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/vomizid.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/21334231651.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/rijafatolakisapag.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/93624716437.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/timozegemok.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/sisuximemojiregutup.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/sumigurivizebataxivofin.pdfIn PDF document text
    • http://393citizen.com/upload/files/rotinatozowo.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306147328502.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sopavuka.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/nazusofapeluxukage.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/211004011446049073d8a17.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_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 11744 bytes
SHA-256: ffd79bb585979d6b05d896566811511b5cb2d920e4014d2f34ed48dd687bb0fc
font_01_sfnt_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 18984 bytes
SHA-256: d083698ecb3dc1f5c2f7e52f66857dae40e41ea4437962341a3a7ee3f85353b6