Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e16d0e66335b4d6…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 10:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9f54849e657473224d098144eec25760 SHA-1: 20c4e80cedc429b30e0db7eda98191062944541d SHA-256: 5e16d0e66335b4d6aac6ffe5847f6352cdec7e6d565d86f1f6dc5e92244e3523
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=best+free+crossfit+app+android PDF link annotation
    • http://bozesedixek.mywebcommunity.org/bose_soundlink_3_manual.pdfIn PDF document text
    • http://dipolomisegon.iblogger.org/52513684610.pdfIn PDF document text
    • http://leaninrzpd.site/47920724302zzrby.pdfIn PDF document text
    • http://apparently-home.com/mowugeruzunujerovitujunortvl7g.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/34884957396.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/human_body_systems_quiz.pdfIn PDF document text
    • http://prizinsta.online/foxopigasena0ctim.pdfIn PDF document text
    • http://lienforkid.com/96791031335w9q81.pdfIn PDF document text
    • http://pukutabutosu.22web.org/logo_barcelona_dls_2018.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/paul_c_bragg_books.pdfIn PDF document text
    • http://idealslim-ordina.site/75783245708jobtk.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/calculus_and_analytic_geometry_by_m._n._m_talpur.pdfIn PDF document text
    • http://limavirom.22web.org/how_does_eigrp_establish_neighbor_relationships.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/dejikikideg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_c1c9dfbc2c5b409780bc9fb046cd163d.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/60935940044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf9b4e5-82c1-4a5b-80b3-568d11224b32/73118224377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2f40b2-dfce-47e7-b639-640af659960f/free_printable_easy_guitar_songs_for_beginners.pdfIn PDF document text
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_28395bdc7d1e405daf9ccc1b9acc7f92.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_757839b1079247bf8053271138b36a62.pdf?index=trueIn PDF document text
    • http://jofawapedoguw.rf.gd/cg_song_new_all.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225223a3-27bd-46e4-9e18-5e73d58b4be4/romeo_julieta_cigars_mini.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_4b63caff88e34469b993b8c94fc9e1fc.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_3e6b4bb392cb48c4b7f7154a056a425e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e535e2-90e0-4686-822f-ac6643982d55/when_to_plant_tomatoes_in_houston_texas.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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 5164 bytes
SHA-256: 71cb18420f93f1616d4d41a31a34507c8d439d5768a194487d7730cd1887f831
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 10984 bytes
SHA-256: d56e87d6e5b6d454be1ae3e0fa88c19474a39caffbeb81bd8cd7646478336e5a