Malicious PDF — malware analysis report

Static analysis result for SHA-256 788b1bba7344abc6…

MALICIOUS

PDF

76.5 KB Created: 2021-04-06 20:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f4e516229d20388896ab40284c4d88c5 SHA-1: b696f6340c5497f938abf830dbf2efe2e8060ff5 SHA-256: 788b1bba7344abc6521b43093757fb012ce8327b47cb84d66344a6aead27c5de
186 Risk Score

Malware Insights

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

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 0.9997

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://resalured.ru/award?keyword=all+medical+laboratory+apparatus+and+their+uses+pdf PDF link annotation
    • https://jivezevovofefav.weebly.com/uploads/1/3/4/8/134896957/juwiritik_tijugaserub.pdfIn PDF document text
    • http://prizinsta24.online/why_is_the_windstorm_significant_inmn631.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/73293723071.pdfIn PDF document text
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/nomukeneruxuvo-vujuzafozuriti-xetodakabomux-lesif.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/rezixonozumawe_sarexixapipi_jewilotubipak.pdfIn PDF document text
    • http://demask.space/43812717714503ef.pdfIn PDF document text
    • http://org-fruit.space/jerasopisekexuljsz60.pdfIn PDF document text
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/jogom.pdfIn PDF document text
    • http://krepezh.guru/the_brothers_menaechmus_character_analysisjudyr.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/65973814740.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/aa7e35f482022a.pdfIn PDF document text
    • https://sexevubof.weebly.com/uploads/1/3/4/6/134697369/0c224b.pdfIn PDF document text
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/7265770.pdfIn PDF document text
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/sevefubenenit.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/877959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexofapu.myartsonline.com/buxibodedadirirefajunava.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/mathematics_grade_9_teachers_guide.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/what_jobs_bachelors_degree_in_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/android_application_auto_boot.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/agricultural_water_management.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_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 5628 bytes
SHA-256: 33f250f2a5660562a93321c0496eac764705770061fb852ad61dcf78c429f8b5
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10284 bytes
SHA-256: fbbb4fb2794c8bc69dc4e422cc00d61a0d40f77bddfe9102510c03c7051e3de2

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