Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b290c274ba9c35…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 10:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3978eaccfda8c5bda8aeb439d018d3e8 SHA-1: 2b4d995731137469c3be072bf1515335f465cc54 SHA-256: 13b290c274ba9c35b9c81641e688c54f9ffe670beb5f06dd3608d27892ab31a9
134 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs and a heuristic for a 'download button' lure suggests the document is designed to trick users into downloading further malicious content. The URL 'https://infrive.ru/uplcv?utm_term=download+pokemon+ultimate+mega+fire+red' specifically points to a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=download+pokemon+ultimate+mega+fire+red PDF link annotation
    • http://hooleihomes.com/cms_images/file/petafa.pdfIn PDF document text
    • http://taxfreepoint.com/file/lejavedetavonuwuz.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/vagavovogitopisenuno.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/verasezofivukup.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/finidomebegifomemew.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/difavanijasatedemi.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/11989801126.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/75369921840.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///53297704668.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/velanolupiwakuwugiruxutof.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/80409227151.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/dudegomanabibowajep.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/sawipepozemopi.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/butitovereserusa.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/liwajaziba.pdfIn PDF document text
    • http://asid.rw/userfiles/file/mipuv.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/kerulenelaseroxuvubafeper.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tidutira.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tezosilimuxinub.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/77807400148.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipozapopuna.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/35367471297.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/64299694355.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/2169856779.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_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 20288 bytes
SHA-256: e1a270f6e5e2f906d178fb2dc60d59fd02cf4185ea8b11c08e978d7bd143ff1a
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 10952 bytes
SHA-256: f4e9e079d4d92dad7aa1210b26c374b95a3e038b4dbefef23556d79daaa09d3e