Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1cb7b1b873f87a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 00:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0fb1bfcafaa8a4bfc5d1d8d868821628 SHA-1: 55d3bfd92968cfb2a267f3d64586d241ad8e321a SHA-256: da1cb7b1b873f87a11b589681b336ec6935aa04a62d9ba37e6748231c9f96c2c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=historia+de+los+aditivos+alimentarios+pdf PDF link annotation
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/sisosi.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/xegofevik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_60287b6933deb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465397/normal_5fc9a4217638a.pdfIn PDF document text
    • https://madigapelodawip.weebly.com/uploads/1/3/4/8/134846312/5292501.pdfIn PDF document text
    • http://mon-cmbretagne.best/clean_inc_raleigh05bmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_603f3d4d72a57.pdfIn PDF document text
    • http://jusapp.club/como_se_desarrolla_el_covid_19_en_un_individuo6ayy6.pdfIn PDF document text
    • http://keepsufi.space/borg_warner_velvet_drive_72c_manualux2o8.pdfIn PDF document text
    • http://ketrovk.xyz/how_to_use_olympus_om_10_cameras3rmp.pdfIn PDF document text
    • http://olivamebel.com/guwafabopobaveevi.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/0faaaf72d01943.pdfIn PDF document text
    • http://fruit-italy.space/19475451621nn8c.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/be1748025bd3.pdfIn PDF document text
    • http://policyhelpcenter.com/wireless_n_wifi_repeater_manual_em_portugues0ctpk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxomin.rf.gd/anemia_por_deficiencia_de_hierro_absoluta.pdfIn PDF document text
    • http://manepiri.epizy.com/rome_metro_map_with_attractions.pdfIn PDF document text
    • http://jabepujun.epizy.com/batching_plant.pdfIn PDF document text
    • http://zoratazux.epizy.com/aprendizajes_clave_de_artes_secundaria.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/is_ipad_air_good_for_animation.pdfIn PDF document text
    • http://ruxukakex.rf.gd/29422858109.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/telugu_ringtones_2019_naa_songs.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_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 5208 bytes
SHA-256: f4e7a51308c601d8af982f52b4043b8d6a158c31502d4dde4317a0a6d6b58c76
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10668 bytes
SHA-256: e930a9a2b9f0606e7170f26d5cc2749cdb2f294a2e45b439acab83ba11837ccd

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