Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd8eb21a5bfcc64…

MALICIOUS

PDF

70.8 KB Created: 2021-03-03 07:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d1eb777b9ef6698d86e2593ac3de4cd1 SHA-1: 5b3d3b69fdc17b37908d4fdfa6b4926e501e61c0 SHA-256: ebd8eb21a5bfcc64de4d0e48b83eb76ec0c89f2370f5cb37cb94d3fd796c6285
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm or phishing lure. The primary URL, 'https://ponafet.ru/123?utm_term=what+is+f1+on+fisher+and+paykel+dishwasher', is presented in a way that mimics a search result, likely to trick users into clicking. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious sites.

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://ponafet.ru/123?utm_term=what+is+f1+on+fisher+and+paykel+dishwasher PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fff4eac4d797.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/gesodowa-juwevuribes.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/7447696.pdfIn PDF document text
    • http://itfamily.pro/estudio_del_trabajo_2_unidad_1xnapn.pdfIn PDF document text
    • http://blablablacar.online/computer_hardware_basics_in_hindib2spc.pdfIn PDF document text
    • http://alluniversity.fun/kalinka_piano_sheet_music_freeouq1d.pdfIn PDF document text
    • http://repovor.22web.org/75336999195.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/vamaxopepika.pdfIn PDF document text
    • http://fojosug.iblogger.org/9135057016.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/1f6e99e360804f.pdfIn PDF document text
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/gologexarizotineditu.pdfIn PDF document text
    • http://specialsale.info/602639647672ujpu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gopuze/75260580556.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/aachen_cathedral_guided_tours.pdfIn PDF document text
    • http://lepuxateg.epizy.com/70051204852.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/rexulowunedofiv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 5240 bytes
SHA-256: c0e99e79a4796af4cdefee2afc2a37b789f3ce0d844b2914226d2feee353a902
font_01_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 9804 bytes
SHA-256: 33599870ae57f7f3442fb2badaa6413a4a993adfeb6ffc04c637787b49e79891
font_02_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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