Malicious PDF — malware analysis report

Static analysis result for SHA-256 7283452833c55e01…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 23:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 53221bdb859f3e230feebd6dc0ceae22 SHA-1: 206f297b3ad92de5edac6ee84289781aa679116d SHA-256: 7283452833c55e01f300c7d6015476f0db1124bc1627a3b81af9bf875b8669cf
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a theme of 'culinary math conversion worksheets', likely a lure to disguise the malicious intent. The presence of multiple links on disposable hosting further supports a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=culinary+math+conversion+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fe625f004d85.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/the_son_of_neptune_book_cover6ra0a.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/hdfnYap/samsung_xcover_pro_battery_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/Yjdjbf9/divani_patchwork_in_offerta_ikea.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/TovNxgc/brain_games_for_seniors_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/hjCY1Ef/xilorarisowaminoralijo.pdfIn PDF document text
    • http://tekplafond.xyz/segofugewelere6793x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_604694595861a.pdfIn PDF document text
    • http://max-lifting.store/one_stop_financial_services_v_neffensaan_2015_wccnga39.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/cgdi6je/lunurodovizobuputaroful.pdfIn PDF document text
    • http://edevletorg.com/50614682197xi6fs.pdfIn PDF document text
    • https://cdn.sqhk.co/zomuzuta/ibgjFi2/ethiopian_newspaper_reporter_amharic_version.pdfIn PDF document text
    • http://dreamingdeveloper.com/93221337804x7bq2.pdfIn PDF document text
    • https://cdn.sqhk.co/dozumapufa/b43QhdB/96142975233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jabejanaboz.atwebpages.com/33036106311.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/vikoworonare.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/bridge_to_ielts_student_s_book.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/mapa_de_carreteras_de_portugal.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/ginejurasuwituka.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/faruniviwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/identifying_adverb_phrases_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 5264 bytes
SHA-256: cdc57900911e1d16659729f0ad493d00d17960af00d3996d255494fd76e2b274
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10900 bytes
SHA-256: df14f3ed59a55c2ff9790c38af253871339bad36d9fb9bf5baef9b86d50b1d3a
font_02_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361