Malicious PDF — malware analysis report

Static analysis result for SHA-256 8219e2286db97451…

MALICIOUS

PDF

91.2 KB Created: 2021-03-28 09:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1ca6802796b04b6d6c948542ca625b9e SHA-1: 9500b1e38388ce59baf797b9b76f6b227f52dcae SHA-256: 8219e2286db974511e85957a00c7e374f034ca8d3ad751a084417624785c0831
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious or disposable hosting domains, identified by heuristics as a link farm and a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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/strik?utm_term=dell+optiplex+9010+small+form+factor+specifications In PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/kajisuni_guxaj_suwimipumisawo.pdfIn PDF document text
    • http://100p-f.ru/taylor_digital_food_scale_costcochrss.pdfIn PDF document text
    • http://supportcopyright.net/kaw_lake_duck_report1vnbf.pdfIn PDF document text
    • http://obuv-kozha.ru/522153317720qkc7.pdfIn PDF document text
    • http://grizhoff.ru/classzone_home_tutor_spanish_3_answers191qq.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/assessment_centre_process.pdfIn PDF document text
    • http://astropsychology.site/spirit_halloween_animatronics_pennywiseifpfa.pdfIn PDF document text
    • http://tokio-2020.fun/dbt_resources_for_cliniciansge8q2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5fd08256f216a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_600dabdb73ad2.pdfIn PDF document text
    • http://mail-autoscout24.net/lepavijumarikasajimufim64cpy.pdfIn PDF document text
    • http://gloslides.com/presto_07300_stainless_steel_electric_skillet_12_inchbnh17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481510/normal_5ff58895a1ee9.pdfIn PDF document text
    • http://keysecret.ru/what_does_the_boomerang_do_in_links_awakening37zmb.pdfIn PDF document text
    • http://wordsideget.top/el_pequeo_vampiro_resumen_por_capitulosikd7e.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/meaning_of_bounded_rationality.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/nabibidar.pdfIn PDF document text
    • http://ericksandoval.com/determinant_matrix_worksheetk6lz9.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/medicare_claims_processing_manual_chapter_12_section_40.1.pdfIn PDF document text
    • http://podarokinsta.site/what_is_the_difference_between_the_ruger_lc9_and_ec94rky6.pdfIn PDF document text
    • http://reduslim-eu.site/pitokirupunofanofigogo146yz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavisekenesavof.myartsonline.com/noviba.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_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 5580 bytes
SHA-256: b4441edcf65ac0322d46d7f1df637d89442c2021594bc9d6598872bb0642d66a
font_01_sfnt_off0001374c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374C 11348 bytes
SHA-256: 8fd8d825d0076e92f36482b69e1d9f6f6ec93b924042d49750471cb7ddc367cf

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