Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae07ba8859f7b48…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 08:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02c57337c4546780aa708f2c6af5f40b SHA-1: 9bd74ee1caf688bc8cbd63a76a094d13ccf410d1 SHA-256: cae07ba8859f7b4804b6d29efa4c9d45eebf4d15d447cdb32c6b371139fd87a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination, and one URL specifically mentions 'download adobe after effect cc 2017 full crack', suggesting a lure for pirated software. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aedelsur.com/contenido/files/tezesedibufimuwuja.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613311cc42122---budisokudakikuf.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/28092563917.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/33810730497.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/89440660134.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/figetuk.pdfIn PDF document text
    • http://pk.mo/userfiles/file/wumesokesirimeg.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/79243130001.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/54706912921.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/8650046888.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/19986485783.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sefexigu.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/kesapaxamefunanojaliket.pdfIn PDF document text
    • http://yongqingtech.com/d/files/11561496864.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/difovazagipaviwodile.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/68544438030.pdfIn PDF document text
    • https://finliz.lt/i/File/vodezoxiris.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/71270481616.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/79455787675.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tedor.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613718b53377a---20244675770.pdfIn PDF document text
    • https://dacola.com/upload/files/kolijezamomotiniwogesu.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/69694611145.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/33953508387.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/wobatuzurejinunir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+adobe+after+effect+cc+2017+full+crackPDF 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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 16424 bytes
SHA-256: 53e10b4634ab690ba97dc137fbb96a6038dbd2ce8aa7fe4c02db0c3bd24a2277
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10972 bytes
SHA-256: c64b3dbbcf99ab41e8148915203f8489ef285ab409026b5c95d80f70acc36717
font_02_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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