Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d9c32636a2d14e…

MALICIOUS

PDF

83.4 KB Created: 2021-06-03 05:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c5c04aacc761f207549914bcbde117ec SHA-1: db3fdc838deca2a9680e047a8cb9bd0a15f4d6dd SHA-256: 65d9c32636a2d14e0f65f872aee4423cc99c6356ba90f111ef90319e4d51e972
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://memozarukun.weebly.com/uploads/1/3/4/3/134378051/5211654.pdf In PDF document text
    • https://zapadakutomar.weebly.com/uploads/1/3/2/6/132680787/629620cb94c81.pdfIn PDF document text
    • https://siluxukazikuwo.weebly.com/uploads/1/3/5/3/135326211/1372315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_60b841c5bb0ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_6008b5d8d6cb5.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/sumuf-wodisufef-kitenaravali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449990/normal_6032dcb1d3334.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/4eec45.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/muzesoxefoz.pdfIn PDF document text
    • https://bibawegosisuzu.weebly.com/uploads/1/3/5/9/135961680/9398744.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=imperial%20infantrymanPDF link annotation
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411453/what_is_law_black_law_dictionary.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/f/36825882025.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144538278/toastmasters_evaluation_form_speech_4.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144421230/foditutilaxo.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/phonics_activities_for_kindergarten.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/18931397828.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/f/pobunelaluma.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144424623/11522464588.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144498792/46360238840.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144416139/lexisnexis_police_report_customer_service.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144498855/difference_of_two_squares_worksheet_doc.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144534006/ejercicios_resueltos_metodo_de_dos_fases.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144417906/39643337495.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144414993/44500456403.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_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 5068 bytes
SHA-256: 86198214d911677bc61c028695cf0b56652c475432ccb78c35bc220f75da2b8f
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 10716 bytes
SHA-256: acc07e206a96dbf6c66f1327ad91072d310c13084be9deaf0620d1aa9d1cb158
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361