Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f7276ad3f578e8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 08:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2f891de7481aad793415809607853e8 SHA-1: d38e42d0192f356c401bbc0f5e5aa67301ee42af SHA-256: c0f7276ad3f578e8e6a81d5b3e11c72374842074a5ad3e12099eb1bb1139d300
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to external, potentially harmful, content. The presence of multiple external URIs and the link farm heuristic point towards an attempt to manipulate search engine results or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=instagram+likes+free+online+without+login PDF link annotation
    • https://sfeerweter.nl/userfiles/files/25795719686.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/12502178333.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/13359915417.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/67240862011.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/tesulepedemujisaxatusuzop.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/3443334018.pdfIn PDF document text
    • http://bjjiffy.com/upload/41631219419.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/panoxawefukamapodusob.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/lexipi.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/xinezanawujom.pdfIn PDF document text
    • http://eventaipei.com/upload/files/74392125481.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/64328568470.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16136877546a04---45813202578.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/vogidovazi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gewubivibakunijubug.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/87583573965.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614434136a88a---vejuwugopa.pdfIn PDF document text
    • http://kammed.com/userfiles/file/wamitufasoxon.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tofekitujudavem.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/tulanirarutavowaxosowi.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/surunapinipenud.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gasowamonitimi.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/davutavadijawokaxev.pdfIn PDF document text
    • http://turnyras.lt/Files/file/sakumixidozefo.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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 19232 bytes
SHA-256: 6c70412f90c32e858430195ffa7b25c3afc3727d6d4e2e620aa0571e251b663f
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 10888 bytes
SHA-256: 3aae7203b896c782b687b04c92be424f43058a213e80c0bf30f6133d96ff150a
font_02_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1