Malicious PDF — malware analysis report

Static analysis result for SHA-256 5737c06e71e138c2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 12:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08a29bd9c0963ad30ded57293257263f SHA-1: 684a99d88fbfd899909c6ccd35072db731601560 SHA-256: 5737c06e71e138c27cb3c2fc665fcf56f6cffdcd7aa1da887eaad6c069493d5f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable hosting, a common tactic for link farms and malware distribution. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://irlanc.ru/uplcv?utm_term=adjective+worksheets+with+answer+key+pdf PDF link annotation
    • https://interstudy.net/userfiles/file/dupupupenobeniwu.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/61871074674.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021937231792.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/batovisajomuwutovusam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lukorag.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/siperoramemivonu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/welovifor.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/ganizexudufurufewovexeg.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/nizunik.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/27369752275.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fatiseboziwike.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/95490697193.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/karegijakumezipubegut.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nuxoweziji.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/98084509456.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/boteretakugeburiwinize.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/33386383076.pdfIn PDF document text
    • http://lejonhund.com/upload/69584886200.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613773b97d300---salipitu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/92344358551.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/49570529771.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/2363137261.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/segubiv.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/13891756438.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/nozivemozewodopebipatuli.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/laluperumeniziti.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/73702910758.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_off0000b659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB659 16400 bytes
SHA-256: 173a078d33fb756f62c500d6875f88b447cc39433bcb79469c446e0af546d448
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 11140 bytes
SHA-256: d8509f83db08765ea2b188f9fb23ccc425dcab6dcc9d6737f12d9a759feea63f