Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c82a579a55e9f0…

MALICIOUS

PDF

91.6 KB Created: 2021-03-02 23:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a328a2fb23dbadfd8279852f2894ed0f SHA-1: b211866b4a5c8d7eb3aea7c582386a48b0e45dd4 SHA-256: f5c82a579a55e9f0e334b9fd32986d92ab16542cb91b8b3870c33daa40daab03
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is associated with a game-related keyword, suggesting a lure for users. The PDF also functions as a link farm, further supporting its role in directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=plants+vs+zombies+2+unblocked+hacked PDF link annotation
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/a77581573.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/sokez-bigebumanedegi-kixizesabanelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fd6770c6aa77.pdfIn PDF document text
    • http://betmoy54.com/didipibanuh1w5f.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cbse_6th_class_maths_textbook_solutions_in_hindi.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/6168201.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/39371069693.pdfIn PDF document text
    • http://7lessons.site/how_to_heal_your_hurt_feelings3d06d.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/20478687716.pdfIn PDF document text
    • http://floradoma.net/76252776947305ma.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/new_free_wordpress_themes_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fd76c33ad6ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_602f82435c3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_603878b294493.pdfIn PDF document text
    • http://blacklaser.ru/mubelomoserudoox7lx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_60124fd64a2a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://woranuganavot.myartsonline.com/319931155.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_much_does_a_retired_coast_guard_make.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 5412 bytes
SHA-256: a3e3563b58ddf2c6ce9a6e5c77bc5ece96cfe6ee518f0a5d0dd76bbe486cb860
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 10404 bytes
SHA-256: 851bed18d518d412b5002469da9d193d19971fcc7b230991cec2f2ccf6519c1b
font_03_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_04_sfnt_off000151ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230