Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2f8d6398bc3411…

MALICIOUS

PDF

71.0 KB Created: 2021-10-04 09:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d64aab27f90dcaad9bfee800888838ac SHA-1: 86b4c448bb32f1b30b60169fd9433dbd56762d1b SHA-256: df2f8d6398bc34115054772808f99dadf0e0aa1b4f8e56648a1e68b1fd677724
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file uploads or content delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to create a network of links for deceptive purposes. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=old+man+doing+exercise PDF link annotation
    • http://cuacuonnhaxuongbinhduong.com/upload/files/39440340028.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/zejato.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/folokujorozipelejekox.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/31895758986.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/13693392567.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n7n8i43vcsmba5ou9i5rtl8m1t/mirabeka.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/75855294735.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/82856681428.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/59019115797.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/177718478.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xizefawurumetelas.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/vikeridosasixifufigu.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210921_CF94C66422AC0B36.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/8531608843.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e55a116de542a11c5d4d7f64ff652ce9/44250635464.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/56712200887.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/48444347085.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/jisuwenonew.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/lezino.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/belexerag.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/59948056064.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/xepato.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/kuramunope.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/63095382818.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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 17120 bytes
SHA-256: b1ae4492da3a4a03b434edea2789651b421cf1949c84f739a7270a0ac91cac0a
font_01_sfnt_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 10744 bytes
SHA-256: 9183a3f16ed2f01ff0568b5c9da548f100b3ad4b274d1e326b3bbd4fd0a4158d