Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e050265890acae…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 07:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c0347a48e0f6c28cd3e20b9f58579129 SHA-1: ceeb3ac5de94d4af2d084be9d9d9a8b2303ada56 SHA-256: f5e050265890acae82d0cb1a6f0f24e819a536da025bbf7609b8490827071931
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The primary URL, 'https://jacksth.ru/wix?keyword=texas+studies+weekly+week+21+answers', suggests a lure related to educational content, likely to redirect users to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=texas+studies+weekly+week+21+answers PDF link annotation
    • http://chunyoo.com/boriragofenapijwhuo2.pdfIn PDF document text
    • http://tujasumetozuku.22web.org/pesologesasoso.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/how_do_i_remove_the_dots_in_a_table_of_contents_in_word.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/ic4H9n3/28401824172.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/hj7zOkP/simple_brick_breaker_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/MKxMSgc/62355925144.pdfIn PDF document text
    • http://lovemecompletely.com/562444352059uia3.pdfIn PDF document text
    • http://pedrons.space/tibapilxsll.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/GQjdhaj/78884983632.pdfIn PDF document text
    • http://azalea.store/power_book_2_season_2_episode_115rne1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dawutanarav.epizy.com/ibps_guide_lic_aao_capsule.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_f3bfccefe24c41049f047bb7f4f914ed.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_f5755dd4346640adb69d86096d2d90b6.pdf?index=trueIn PDF document text
    • http://novosumagib.epizy.com/maplestory_come_find_me_guide.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_2c6d8b50a86347099aa1eed38b5f2593.pdf?index=trueIn PDF document text
    • http://tafiwepamubov.atwebpages.com/sakevezewo.pdfIn PDF document text
    • http://natunolujekusi.epizy.com/why_do_we_need_critical_appraisal.pdfIn PDF document text
    • http://malinaliwul.epizy.com/kovusav.pdfIn PDF document text
    • http://segisubab.epizy.com/tapipoleforidod.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_1ae9d7b9b260400581f550cfb6f4669f.pdf?index=trueIn PDF document text
    • http://bumufemukelogik.epizy.com/42460593151.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/fly_fishing_guides_portland_oregon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 5276 bytes
SHA-256: 1ba7c77b6f3fffe664fcf9ebcba06cc126455bdc70f02ce7199a4a0fd2583e0e
font_01_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 10720 bytes
SHA-256: 227f441d6abb44615e043690bd5cf5b05c09798d82c1810bb4964df1b3a8e8d0

Open this report in the interactive analyzer, or submit your own file for analysis.