Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5180747a01abc0…

MALICIOUS

PDF

74.4 KB Created: 2021-03-13 18:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0ef5290764ae26e41453b2c2f0c191ee SHA-1: 28832b36ad17a90f1f64f470f2393f5f5e8212ac SHA-256: 3d5180747a01abc06c84f55b66d97d25ecd07fbb243bf23eea0e2df4a5fe37c0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used to obscure malicious activity. The primary URL, 'https://pelibifir.ru/wix?keyword=download+foxfi+apk', suggests a lure to download an application. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=download+foxfi+apk PDF link annotation
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/komurokaxokipax_bagof_fovaref.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_5fe95c2ad0408.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/xepiluma-rexiribujavixe-manuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5ff47d7b271f9.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/5446380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_6047bb6e87a93.pdfIn PDF document text
    • https://genoduvule.weebly.com/uploads/1/3/1/4/131407197/bd9a007dd579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5ff346575e30f.pdfIn PDF document text
    • https://dobuxavebixeli.weebly.com/uploads/1/3/4/7/134725246/d5a4e937f0cb0.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/9281117.pdfIn PDF document text
    • http://dobogoj.iblogger.org/42902455538.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/6593524.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/2e31551826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filamejukak.epizy.com/android_pie_c_g_mi.pdfIn PDF document text
    • http://rifesos.epizy.com/barbie_games_apk_free.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/bissell_proheat_essential_parts.pdfIn PDF document text
    • http://vafukibugaf.epizy.com/rancilio_silvia_pid_diy.pdfIn PDF document text
    • http://xelidamos.epizy.com/video_show_pro_latest_version.pdfIn PDF document text
    • http://tetaxejil.rf.gd/dd_character_sheet_3.5_app.pdfIn PDF document text
    • http://getetir.epizy.com/bosch_tassimo_vivy_ii_manual.pdfIn PDF document text
    • http://kupavojos.epizy.com/lagu_carabao_made_in_thailand.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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 4984 bytes
SHA-256: d8e3dd6058c767ef5940e5f541bc46105a2498653c140e2d49435c9afaa38e52
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 11220 bytes
SHA-256: 78f211fdcce5a26a0be3104e1242cfcb1a04562ccf6ad8e1dce56deca2bb057d