Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb71eddcaf0d4f50…

MALICIOUS

PDF

78.6 KB Created: 2021-09-29 02:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26b45c26a032057abaf2d9427dd01c65 SHA-1: 53bd7d6a02a51bb08027b4ce174d3cf9efa3dbcb SHA-256: eb71eddcaf0d4f5098885256713c041c520509439fff6549c7769091cba64e47
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The presence of many unknown reputation URLs further supports this, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://chrisdepanneservices.com/Sites/cds/files/kirelerazixitebuj.pdf In PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/77942687460.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210929070618182216p7lxepb5jgir.pdfIn PDF document text
    • http://1472bond.com/upload/Fckeditor/file/sesuwipisudovuruzori.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-13/20210913081913870475.pdfIn PDF document text
    • http://blgjad.com/upload/files/xojiwuxenozuvaxot.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/rurivewekoton.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/83686644058.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/5833201932.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/rogepiminewuwozisikejutep.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/44119951477.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kesunabujuxetodagilepu.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/silolijokig.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/49122916908.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/dekukunolivos.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/doribisi.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/nuzoxukododox.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/3384447807.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/rifefogawap.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/87432876555.pdfIn PDF document text
    • http://zeci.nl/im/image/56004114436.pdfIn PDF document text
    • http://alvitraders.com/files/93536658661.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/wisuratoxidagikaj.pdfIn PDF document text
    • http://hongdacable.com/d/files/widozixitugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pixel+experience+for+redmi+note+3PDF 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_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10724 bytes
SHA-256: 843201510adf1e3dbdc143bf2099cce534ae319ec08b7383318964a9da7d632f
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 19656 bytes
SHA-256: 296ebe200d11cbc528ceb21072a677513b9192cca8184db6ae4e4b624eefcc50

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