Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ec3008eccb3f59…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 20:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ea7f1c6d162f74222b7341e725e533a3 SHA-1: 9c03225064d17f441e23086796a72b93adbf70e7 SHA-256: f7ec3008eccb3f5970ebd7dea9b38fcc3222d0d877f2312ee1055d18c43f8ec9
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying it as a "PDF_SEO_LINK_FARM" and another as a "PDF_SEO_DISPOSABLE_LINK_FARM". The primary URL found, https://golowaki.ru/award?keyword=secret+forex+hedging+strategy+pdf, suggests a lure related to financial strategies, likely to entice users to click through the numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=secret+forex+hedging+strategy+pdf PDF link annotation
    • https://cdn.sqhk.co/foropogajag/giT8hdu/mobos.pdfIn PDF document text
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/03dc14a2.pdfIn PDF document text
    • http://usejus.pro/lonafebaka5v97s.pdfIn PDF document text
    • http://ledimpress.biz/angles_and_triangles_worksheet_7th_gradeilwn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_6023d9fa24ccb.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/jifumuvarazo_zagajuzaxesopi_vesepabelolov_sevaru.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/Jhhihje/zonefejisipag.pdfIn PDF document text
    • https://cdn.sqhk.co/labokezugumu/S3gc3QQ/avillion_berhad_annual_report_2018.pdfIn PDF document text
    • http://vienvozvrat.site/formato_historia_natural_dela_enfermedad_para_llenargqdtu.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/tjefjgs/htc_phone_weather_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/gfhdie4/68349964248.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/bOiacjb/star_wars_galaxy_edge_movie_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_60378eacca2c3.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/8430676316d6mao.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/972caf8651aa65.pdfIn PDF document text
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/1170452.pdfIn PDF document text
    • http://medgaj.com/ruliluvuh13rs.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/folazomigiseso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29e410c-c686-48b7-b469-71aa6e44a6fe/lawn_boy_self_propelled_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec07133-1f69-43e3-b37c-a6bcb4c55fab/28926713210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c56958-6e45-4b4b-a9cd-a8bf3cb8f3f4/32926589521.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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 5656 bytes
SHA-256: e1ac29d09ed1579ac45d726638f4a2acce2a9b95d07b0ad8abafe4c8d9f12d0d
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 10860 bytes
SHA-256: 0be15f2d7fa8c8c3c0024e5aeed229665efc008a7b68fb8501dc23a2253e63fc