Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0540f4d6ca55b5…

MALICIOUS

PDF

83.0 KB Created: 2021-04-04 20:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c1b4ef113403a6eb5c007234024e5b9c SHA-1: f8efbd04fd5975c6cc6968d3d9781a869d17f500 SHA-256: 9f0540f4d6ca55b5e150a1f68df0981f63c1b7db41e53152daff92a9304efb31
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and a visual download button suggests a phishing or social engineering attempt to trick the user into downloading a payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'bioassay definition pdf', which may be part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=bioassay+definition+pdf PDF link annotation
    • http://marketeuro.pro/bergeys_manual_of_systematics_of_archaea_and_bacteria_download04oum.pdfIn PDF document text
    • http://tersq.fun/6791995567078lr1.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/why_my_acer_tablet_wont_turn_on.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/6271306.pdfIn PDF document text
    • http://zanartcc.net/27394373031j9ht7.pdfIn PDF document text
    • http://iranomics.com/how_to_program_rca_universal_remote_code_searchgazyx.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/47323549116.pdfIn PDF document text
    • http://service-hire.com/tibuwowucqwbs.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/6947167.pdfIn PDF document text
    • http://xtina.online/kuxogovoldsom3.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/piremozodokubovuzot.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/bizebimofo.pdfIn PDF document text
    • http://bighome.space/gagimifososimuso5a460.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/does_logic_9_work_on_mojave.pdfIn PDF document text
    • http://sun-italy.space/pawejadofokulecmr8s.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/janodojivi/nibamizokupat.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/bosch_axxis_washer_adding_detergent.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/abstract_example_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/60597302408.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/21926608845.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/vefipag.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_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 5060 bytes
SHA-256: e4cd624f85fa364cbe06d9059400dccb3a5d3a42d1514542163d499826c99da5
font_01_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 11328 bytes
SHA-256: f751174c8a17477c2fbb5df649978794d0cb6d38ee31a8738ad39c8ebc6b0f02

Open this report in the interactive analyzer, or submit your own file for analysis.