Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ea7bd1be3af5e8…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 02:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9cab983be849e123c379e2d604d6d98c SHA-1: 7bfa876fce03be82b6a461dd7e475f69c7fa679a SHA-256: 77ea7bd1be3af5e88c7b6e7ff210903c15322f3b464ec5348ac13429dca32a1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms or lead to PDF files hosted on disposable domains, indicating a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=rumble+in+the+jungle+meaning PDF link annotation
    • https://nutricount.cz/UserFiles/File/gupoxunasi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/82325541742.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210920103155_2nsneu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/vugibazipetazevi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fuferere.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a684055de---perobolefudor.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/14186352188.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210903120304.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/36086793630.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/89729140617.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/pugoriwodewurabi.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/18176423696.pdfIn PDF document text
    • http://freestyler.cz/img/file/wewimudimemivemanawikib.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l50i7thodpa6171fbcglcnei12/59028423788.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bapeminudomukazig.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/39967591206.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/11981543491.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/lewefojoxuz.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/77024481284.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/32274553661.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/45441212896.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/80455154606.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/53273397649.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/22732497154.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-10/file/26990680726.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_off0000b008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB008 10580 bytes
SHA-256: a3262024a3ac0cc7ebb195a8d99c88dd780f490c356d640d5b35817bba0a74cb
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 15232 bytes
SHA-256: e6d44644c05ecc457714aa3a291eca14162d22d374fd8d8097c8e69aa41f3d0f

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