Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d37402ca26167…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 23:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 98f48f6e96b30336666f942ef5f1a2b0 SHA-1: 91b36205cdbb3453150dec24d7868aabe8190687 SHA-256: 1a5d37402ca2616759b3644a7d49fff1d770a0402d129de65d2309317b218da8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'pelibifir.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=philosophical+foundation+of+early+childhood+education+pdf PDF link annotation
    • https://sosojisizavawov.weebly.com/uploads/1/3/1/4/131454692/finugadegaligites.pdfIn PDF document text
    • http://gegezuwe.iblogger.org/bepantol_derma_bula.pdfIn PDF document text
    • http://ipatovaalena.ru/6633500681pistz.pdfIn PDF document text
    • http://samoe-samaya.ru/polaris_360_pool_vac_partskysd9.pdfIn PDF document text
    • http://pukatasenibi.iblogger.org/69365527441.pdfIn PDF document text
    • http://romotogez.22web.org/video_converter_for_android_2._3._5.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/tekumumi-mupogavasi.pdfIn PDF document text
    • http://theraisins.pro/nail_places_taking_walk_insyxsxi.pdfIn PDF document text
    • http://dkshlyap.ru/rexepenetav7zuqt.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/644465.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/925409.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/kubedukowug/62987308101.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/ruxifivenuzufafup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e73634e-8955-453b-989b-3a9ea3d91895/bizinejenaxidarotejije.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/26593464178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df97f52-d63d-4d46-8d8e-d5166edfc5e3/call_me_by_your_name_movie_sequel_2020.pdfIn PDF document text
    • https://b24036c1-08f6-4d5b-b8c9-f4c47f26e437.filesusr.com/ugd/ae9acc_8d1a4636af2b4cee80b5064eb18dd069.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wekibik/vetavikugumozulevotud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86e159b-32f2-4b01-b097-db65a2897211/norukusozowapowev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a744ae-cd9d-4224-b07d-bb9deed5f978/platos_apology_of_socrates_summary.pdfIn PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_a61a549b7f8344bba0ee67524685ff5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d37cbc9-9843-4e40-9d07-120ffcdebc69/super_word_search_puzzles_music_of_the_christmas_season.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_e6b18e2d098d4e2799ee390f9bd605a5.pdf?index=trueIn 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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5348 bytes
SHA-256: c36d1edbd264a8abc95628e129ed9332f92b9aea0ba1a6867e185f883fabfe64
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10592 bytes
SHA-256: 7a36625fbfb138d589e0056c4aaacd02db46374fa4f456e186df4a3350df65b6

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