Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b039b4360c59d8…

MALICIOUS

PDF

74.6 KB Created: 2021-04-04 07:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8b933db865af05ab022296f250a8130d SHA-1: de13eb2abd63b744b93d8cc82a1d584aa19fcfbb SHA-256: 81b039b4360c59d8330d8c1407e97eac7092b6726a2112d5b583e347e3dbb11c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards the document's primary function being to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=stephen+king+book+list+printable PDF link annotation
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/xowukatuzowamadi.pdfIn PDF document text
    • http://cardioactiveufficiale.site/solving_linear_equations_in_one_variable_word_problems_worksheetwils9.pdfIn PDF document text
    • http://tcerkovniekupola.space/da_form_638_apr_2006_fillable_word_documentmle5z.pdfIn PDF document text
    • http://tedusoxunola.22web.org/aap_pediatric_blood_pressure_guidelines.pdfIn PDF document text
    • http://parrrtner.xyz/45684820811amxf3.pdfIn PDF document text
    • http://cocobeautybar.ca/baldurs_gate_2_release_date_ps4fn5da.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/7e3c6550cd1c.pdfIn PDF document text
    • http://formverifiedbadge.com/lenovo_t420_drivers_windows_8.1_64_bito633l.pdfIn PDF document text
    • http://jolamuvinuma.iblogger.org/somaderurapizazajimo.pdfIn PDF document text
    • http://4338bacchus.com/801429177252qvcb.pdfIn PDF document text
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/zobibu.pdfIn PDF document text
    • http://zahlungsservice-ch.site/piano_lesson_books_for_adultshrm9q.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/bitubapupalatu.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/delasa.pdfIn PDF document text
    • http://bloomwithdeanna.com/kizefojapokozolozosu2qvgv.pdfIn PDF document text
    • http://securityverifiedservices.com/mefemotuzedivupisisghdiu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegugus/year_3_english_worksheets_printable.pdfIn PDF document text
    • http://supitemev.rf.gd/a_political_economy_of_the_middle_east_third_edition.pdfIn PDF document text
    • http://matiwusaned.rf.gd/tasoju.pdfIn PDF document text
    • http://voronuxo.epizy.com/fanenajidukanag.pdfIn PDF document text
    • http://bixaxoka.rf.gd/mezodunuwajobuminivajuz.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/50285278086.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/sobidexuzivefok.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 5388 bytes
SHA-256: e9c3c65de2d10863e3ca632eeebb9922bd6fe6ad10af1752d19080a88f9951bc
font_01_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 10356 bytes
SHA-256: 48a9bae06170fc28678537c61fb51e0f615e11e882516263226efa4c2c6b1fc4

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