Malicious PDF — malware analysis report

Static analysis result for SHA-256 5887761a12cd64dc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 16:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58658a5ff52568a3fd134f9d9cfde022 SHA-1: 4ed5d40c02701a9f739eda91a2695b4364264449 SHA-256: 5887761a12cd64dc5ab0987b782db4a5be41305b036dc86cde1f24f85e58c040
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL distribution suggest an attempt to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://0-50.ru/userfiles/file/zukawelamasajosi.pdf In PDF document text
    • http://quangcongluc.com/upload/files/xikibu.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909085646251744gjbnd.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/wolinow.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/27224514286.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/52801871433.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/riwelijonejifazow.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/tinizete.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/pubetejobabobu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12408338593.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/katironepikutolox.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/rivivewulezag.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1ce38f97---disejesel.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/26525049450.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/74890011822.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/59770954979.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kisirevotesemu.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/93748350330.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/naxezirorowiwitewapej.pdfIn PDF document text
    • http://email-database.info/userfiles/file/3174686645.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/24405596779.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///11829170754.pdfIn PDF document text
    • http://yepuco.com/uploads/files/87656047181.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xalumojej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=emerald+rom+hackPDF 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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10248 bytes
SHA-256: 65a33e21c56e88ce31b451ece326cb5b2655a059383bc52327801c2a9b576e79
font_02_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 18692 bytes
SHA-256: d94e9de4da43583225655a73970f857f8cc8b606ef7fc45ffbf3ff2a92ebb651

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