Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2bcde67f6e1748…

MALICIOUS

PDF

80.4 KB Created: 2021-05-18 04:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b543b853b92d202297f703bca6ea2187 SHA-1: 76e04bc54ac5b6fd5b201319cc94dcc2825ff591 SHA-256: 1f2bcde67f6e174830fde202eb29ac90697b0371de9e19cea06df11b120b6e21
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+apology+to+your+boss PDF link annotation
    • http://bakijimape.22web.org/characteristics_of_human_language_in_linguistics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_606aa5ffc1a90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446019/normal_5feff8f47adf2.pdfIn PDF document text
    • http://norudumof.22web.org/kubemapoloja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fdf7d14a89b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxuwer.epizy.com/is_nas_server_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/how_to_connect_my_bluetooth_headphones_to_my_sony_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/writing_a_call_to_action_statement.pdfIn PDF document text
    • http://jijeledinevo.rf.gd/bepanah_drama_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3521680b-c635-4232-b5fc-06d49844ec73/how_often_to_replace_norelco_blades.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/nomuro.pdfIn PDF document text
    • http://vubazor.epizy.com/clinical_laboratory_test_procedures.pdfIn PDF document text
    • http://tejebakaropa.epizy.com/zinimejurif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4c9caa-4c3d-493e-92a0-6086d87f27da/windows_2012_batch_file_not_working.pdfIn PDF document text
    • http://guxodolabisiruj.epizy.com/66156452579.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/mahatma_gandhi_short_biography_in_hindi.pdfIn PDF document text
    • http://bukadalisurofez.epizy.com/el_camino_del_artista_audiolibro.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/xebavuz.pdfIn PDF document text
    • http://judegedemo.rf.gd/acta_de_nacimiento_dominicana.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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 5280 bytes
SHA-256: 71651f07338bdefc6167a1bb70a2f284d2942465a4768fc9685d3506cd4bb8ab
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 10932 bytes
SHA-256: 9bb68a51de56e556dc933c0753dfa7966be91b70dad4ba6c7855256512281965

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