Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2aa56d9fc29b57…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 15:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ef96c0742f0d381180abde2dbc7f7605 SHA-1: 8d27f1e18bd43e0f7985024f388e799d686f0534 SHA-256: ac2aa56d9fc29b57222bc1587acae02e6850bd64404c090001e5a733c0207403
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=child%27s+play+2019+full+movie+online PDF link annotation
    • http://tdvvietnam.vn/webroot/img/files/ketisa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410efa7d691---pegujerefikosu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/96090403156.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94928000719.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/74015005300.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/81869582741.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/9254573256.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/mevonikotujuveron.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/kaxigikivokevotomij.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/kotelumadiwenodopapuro.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86c864eb76c4ad910d9044df6e4bc56d/78645335236.pdfIn PDF document text
    • http://cke.hk/userfiles/kamome.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/kovukubuwulobadejepe.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/23494982072.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/tizedazuwat.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/kevimafozefuvumazoki.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/sebovi.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/mumebiwi.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/95654043648.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/sapuxorixumemunotu.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/kisewonitiduzudawi.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/44752193285.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rekabejabibesa.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_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 17464 bytes
SHA-256: f3069fd20065f602689e8fdb431467b2dfc4b11d28c09bb51d98ea741ef40b10
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 11372 bytes
SHA-256: 4f91b02b99c0e05a66a75e3f9d3de3e98a0d9eb3dc3e282c61776a2d8cfe7709