Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1814f5f0f45dd1…

MALICIOUS

PDF

78.1 KB Created: 2021-02-27 04:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 33c4aebc413da1acb2191d33ac63cbf6 SHA-1: 906cfa3708d37ba85f8e846acf588b5596ca230a SHA-256: ef1814f5f0f45dd1e62097bf5d8c809d184a04918fbe79c2f7a1a3940cabb054
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://jottigo.ru/123?utm_term=what+are+good+neck+strengthening+exercises PDF link annotation
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/xivofebesifiv.pdfIn PDF document text
    • http://sberpodarok2020.online/bein_sports_live_apkidadw.pdfIn PDF document text
    • http://fishland.store/blush_pink_dress_formaljwjqf.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/5254251.pdfIn PDF document text
    • http://3gusevshop.website/what_is_the_difference_between_a_12_volt_and_20_volt_drillv3pz3.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/8047412.pdfIn PDF document text
    • http://italylife.pro/34938042004lz45u.pdfIn PDF document text
    • https://zidipezes.weebly.com/uploads/1/3/5/3/135314083/xemugi.pdfIn PDF document text
    • https://wirupexulabajes.weebly.com/uploads/1/3/5/3/135322132/f1763c25c1f06.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/33117c25afb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizepojuduw.rf.gd/asterix_and_obelix_movie_english_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/arcsoft_totalmedia_3._5_free_full_version.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/sumigezupam.pdfIn PDF document text
    • http://nawexox.epizy.com/sql_database_administrator_resume.pdfIn PDF document text
    • http://sobovag.rf.gd/jipunewenejabufezaj.pdfIn PDF document text
    • http://degivenumi.epizy.com/penadudaxixoxirulibikon.pdfIn PDF document text
    • http://zefumegidadaj.epizy.com/87929748270.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/datuga.pdfIn PDF document text
    • http://xupapuxonoxun.rf.gd/mamopudawimekafimopit.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_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 5312 bytes
SHA-256: 11142d71f9517ee5b792fa47235760d481d7871e600138345a0708f810292bda
font_01_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 10212 bytes
SHA-256: f35534cd8fa2ccd0d9e373520069ceef2c54ca17bdb3a30fe191a894f13a4b61