Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88dea19eb9e12d5…

MALICIOUS

PDF

76.8 KB Created: 2021-04-09 22:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9e7e0d9b403cd832dfbac06808a12a21 SHA-1: dde646c9ca0b83565ec5a1df0f2ef22de2cb5632 SHA-256: d88dea19eb9e12d5e5566cb417e7b5f4b795706debd4dad94e7e183e9cfd2e08
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, suggesting a link farm designed to manipulate search engine results. The primary URL, https://xezojetit.ru/strik, is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=fluke+intellitone+pro+200+manual+espa%25C3%25B1ol PDF link annotation
    • https://wipibafupegivu.weebly.com/uploads/1/3/4/8/134868488/pogomufezabogozi.pdfIn PDF document text
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/defekupanida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6051ae6ae22c7.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/1799894.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/23371e9ade.pdfIn PDF document text
    • http://gozaped.iblogger.org/tactics_ogre_let_us_cling_together_romance.pdfIn PDF document text
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/0211fc66d711d.pdfIn PDF document text
    • http://vekenuv.iblogger.org/free_abelian_group.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fc9dcaa599ba.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/mebirarulejipu_bolozosawiden_kebonafi.pdfIn PDF document text
    • https://vilaluwavo.weebly.com/uploads/1/3/4/3/134338374/welebul-fetuvok.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/vivowuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_60170595d853d.pdfIn PDF document text
    • https://pafolerasakuj.weebly.com/uploads/1/3/1/4/131438226/4cd62d.pdfIn PDF document text
    • https://datakazikuvosu.weebly.com/uploads/1/3/4/3/134353567/f88952d.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/visoderuzegavare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ffe90d75a673.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/d10375f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_602187c81ccdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losiwubalapitoj.epizy.com/spanner_google_s_globally_distributed_database.pdfIn PDF document text
    • http://lubelulezafi.rf.gd/is_vanya_bad_in_umbrella_academy_season_2.pdfIn PDF document text
    • http://wepunulirepobi.myartsonline.com/how_to_solve_analytical_reasoning_questions_in_nts.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/besame_mucho_piano_score.pdfIn PDF document text
    • http://piwufamudadavo.rf.gd/coordination_polymerization_mechanism.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_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 5472 bytes
SHA-256: a6dc510ddf79ec84f4bef2e285b853f1c7dd53f98ee91a17a532f0cc061caba6
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 11752 bytes
SHA-256: 2f41d020c1c21f61ee72a1246c065bb76ed25b1f96d09d93218781525678c02c