Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd838fd8207d2e…

MALICIOUS

PDF

79.9 KB Created: 2021-03-31 22:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 24f0efa66f06e5c961fa21b9cfaa3d54 SHA-1: 92d1c4792dc164435ba6bad8c5c6e4224d485e04 SHA-256: afcd838fd8207d2e61a5b06de24b3295b344f2b18fba4c5baad38da313a6de69
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent URL pointing to 'jumiwimov.ru' and disguised with a 'tax payments' query parameter, suggesting a phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=estimated+tax+payments+federal+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426830/normal_6004bd793c084.pdfIn PDF document text
    • http://vabakavolageni.22web.org/4494935615.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/EqhagPf/63982899510.pdfIn PDF document text
    • https://cdn.sqhk.co/demarumiju/hCrauun/instagram_captions_for_guys_rap.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/iiDgiRs/garupomibimukomibelupumux.pdfIn PDF document text
    • http://safetymirrors.xyz/b36tc_bonanza_turboprop_performance_specs32jtf.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/Lgdixjc/word_christmas_page_borders_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gesuxafom/Zgdgfgf/4210908697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_605b88866058b.pdfIn PDF document text
    • http://vk-settings-change.online/godumopolizoux79z.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/walmart_grocery_app_not_working_with_ebtytarm.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/chamberlain_liftmaster_elite_series_manual.pdfIn PDF document text
    • http://trend-sales.fun/19998793950es9yc.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.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/zevutebulaworel/12481731037.pdfIn PDF document text
    • http://ribaxexumipo.rf.gd/sheet_metal_fabricators_in_peenya_bangalore.pdfIn PDF document text
    • http://fabibobitobabo.epizy.com/26928311217.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/hiwin_linear_guide_catalogue.pdfIn PDF document text
    • http://fedaposadado.rf.gd/tilabarikofonorujagorik.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/tenancy_agreement_renewal_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/cycling_jersey_template_eps.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/zelevobatemavumozawokox.pdfIn PDF document text
    • http://wivukirotodit.epizy.com/denepewera.pdfIn PDF document text
    • http://tojuzurukepise.epizy.com/peter_roach_phonetics_and_phonology_download.pdfIn PDF document text
    • http://gorefadusajog.rf.gd/alfonso_reyes_echandia_criminologia.pdfIn PDF document text
    • http://vufilupirudote.rf.gd/excel_vba_find_rows_multiple_criteria.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_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 5316 bytes
SHA-256: 1882774c755760e584bcd76691f4c786a6b24db21b8b28857169a59e5a7b3218
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 11176 bytes
SHA-256: 2fa8c8b4db595447b2f55a4464d94ed22953632108e9243de547f1df7c09fd67

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