Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b50830b05c9548…

MALICIOUS

PDF

82.5 KB Created: 2021-04-05 19:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 080e12ea2eaed19f019a72dcefdb455a SHA-1: 545968742d969b91be503c865c4eb89e89d0543f SHA-256: a9b50830b05c9548d5db28e251b2b75ea11ce2a595e2a030793a914c3051f8d7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/award?keyword=core+java+programming+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/pemenodisoda/X6Xjgr7/brookville_lake_map.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/6273070.pdfIn PDF document text
    • http://xokewekababawa.22web.org/88816396448.pdfIn PDF document text
    • https://gaxadujabe.weebly.com/uploads/1/3/0/7/130775632/zimoxixabinereruzusu.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/brig6jd/street_racing_dallas_texas.pdfIn PDF document text
    • https://jedegifopa.weebly.com/uploads/1/3/0/7/130738854/kowalafo.pdfIn PDF document text
    • http://axecheat6.xyz/perevoxanubedenecem1w.pdfIn PDF document text
    • https://jolesebadula.weebly.com/uploads/1/3/0/7/130740242/xitatidan.pdfIn PDF document text
    • http://stylecurtains.com/letter_k_worksheetssv4hm.pdfIn PDF document text
    • http://kulinar2020.site/poultry_business_plan_downloadsqc6t.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/the_exorcist_3_full_movie_online.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/singer_sewing_machine_model_stylist_834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufijofitaj.epizy.com/mathematical_statistics_with_applications_7th_edition_solution_manual.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/curso_de_ingles_para_medicos_gratis.pdfIn PDF document text
    • http://zikukoji.epizy.com/ascii_form_feed_f_python.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 5224 bytes
SHA-256: 3f0eb7ca1f558296d68b78cfbc62fcfc9d3c6db060fb25b39c8c57e0e6bf35d2
font_01_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 11232 bytes
SHA-256: ce3f5b767e709895684e8ccee23c30321e852c6df1f65d102e00f21c530d33a9