Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfda61da0cfaf62…

MALICIOUS

PDF

75.5 KB Created: 2021-03-18 16:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac6618c09731f6cf89c830354ec6fe04 SHA-1: ea65c65fa705b22d284165b36cea5e50ac5747ab SHA-256: 9cfda61da0cfaf629fbe28f5de7b6f5f1c4dc101c30ad83c64c240ea26e0f0a1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a prominent one being `https://pelibifir.ru/123?utm_term=income+and+expenditure+excel+template+uk`, suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is designed to host many links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=income+and+expenditure+excel+template+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402267/normal_600aabbe69df2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5ff989a38fb72.pdfIn PDF document text
    • http://futigovu.scienceontheweb.net/jaledowavive.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/read_the_bible_in_30_days_schedule.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/bullismo_e_cyberbullismo_tema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_5fdbaa8677354.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/college_placement_test_questions_and_answersr98ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_60175c84bcad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_6011ebd09e39a.pdfIn PDF document text
    • http://levantegroup.net/tipos_de_investigacion_cuantitativax1dkl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_603e676a293c0.pdfIn PDF document text
    • http://liolika-rsya.ru/jovoxikutevgyxp2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojibikifi.myartsonline.com/where_im_from_poems_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/encyclopedia_judaica_vol_12.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/14370518438.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/41448260585.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/koweg.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/how_do_i_change_my_g_shock_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/what_happens_when_you_burn_real_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/ffxiv_dark_knight_guide_4._4.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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 5108 bytes
SHA-256: 05b032d1317413573d2ad13c341a94d91dbaf61a3461bba4dc5dd492453fde15
font_01_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 10492 bytes
SHA-256: ffd9b143886c8f59c50f92d49c02e26893c1e63a7f8baf79a339a02924e687f4

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